Pub Date : 2023-04-14DOI: 10.9734/ajopacs/2023/v11i2197
I. Lawson, A. Balogun
Reservoir characterization of W-field, onshore Niger Delta was carried out using petrophysical evaluation of well logs. Three reservoir sand intervals (A, B, C) were identified and correlated across four wells (W1, W2, W3, W4) in W-field using the gamma ray, while the fluid identification of each reservoir was achieved using the resistivity log. The reservoir C interval was selected and utilized for petrophysical interpretation was penetrated at depths 11741-11945ft, 11933-12173ft, 11658-11847ft and 11926-12095ft across all wells respectively.The average values of gross thickness, volume of shale, effective porosity, total porosity, permeability, water saturation and hydrocarbon saturation of the delineated reservoir sand are 200.5ft for gross thickness, 18% for shale volume, 21% for effective porosity, 26% for total porosity, 1071.74mD for permeability, and 28% for water saturation and 77% for hydrocarbon saturation. Petrophysical evaluation revealed that porosity and permeability are very good to excellent in the field. The reservoir is classed as clean sands based on the high net to gross ratio (>70%) and the low shale volumes (<30%). Consequently, the low value of shale volume, low value water saturation, high value of hydrocarbon saturation and the good porosity and permeability properties of the reservoir of interest suggest economical and commercial quality and viability of the wells within this field.
{"title":"Reservoir Characterization using Petrophysical Evaluation of W-Field, Onshore Niger Delta","authors":"I. Lawson, A. Balogun","doi":"10.9734/ajopacs/2023/v11i2197","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i2197","url":null,"abstract":"Reservoir characterization of W-field, onshore Niger Delta was carried out using petrophysical evaluation of well logs. Three reservoir sand intervals (A, B, C) were identified and correlated across four wells (W1, W2, W3, W4) in W-field using the gamma ray, while the fluid identification of each reservoir was achieved using the resistivity log. The reservoir C interval was selected and utilized for petrophysical interpretation was penetrated at depths 11741-11945ft, 11933-12173ft, 11658-11847ft and 11926-12095ft across all wells respectively.The average values of gross thickness, volume of shale, effective porosity, total porosity, permeability, water saturation and hydrocarbon saturation of the delineated reservoir sand are 200.5ft for gross thickness, 18% for shale volume, 21% for effective porosity, 26% for total porosity, 1071.74mD for permeability, and 28% for water saturation and 77% for hydrocarbon saturation. Petrophysical evaluation revealed that porosity and permeability are very good to excellent in the field. The reservoir is classed as clean sands based on the high net to gross ratio (>70%) and the low shale volumes (<30%). Consequently, the low value of shale volume, low value water saturation, high value of hydrocarbon saturation and the good porosity and permeability properties of the reservoir of interest suggest economical and commercial quality and viability of the wells within this field.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86847848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-10DOI: 10.9734/ajopacs/2023/v11i1195
Titanium dioxide is hard to coat on glass or boehmite at low pH. In this study, a method to coat titanium dioxide functionalized by Ag on the glass surfaces using a Cu-containing solution is proposed. This method facilitated the coating of titanium dioxide functionalized by Ag on glass surfaces using 3-aminopropyltrimethoxysilane (APTMS). Results showed that Ag–TiO2 nanoparticles can be coated on Al and glass surfaces. Furthermore, they can be coated on boehmite at low pH without using APTMS.
{"title":"Effective Adsorption of Ag–TiO2 Using a Cu-containing Solution","authors":"","doi":"10.9734/ajopacs/2023/v11i1195","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i1195","url":null,"abstract":"Titanium dioxide is hard to coat on glass or boehmite at low pH. In this study, a method to coat titanium dioxide functionalized by Ag on the glass surfaces using a Cu-containing solution is proposed. This method facilitated the coating of titanium dioxide functionalized by Ag on glass surfaces using 3-aminopropyltrimethoxysilane (APTMS). Results showed that Ag–TiO2 nanoparticles can be coated on Al and glass surfaces. Furthermore, they can be coated on boehmite at low pH without using APTMS.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81936950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-25DOI: 10.9734/ajopacs/2023/v11i1194
A. Bubu, C. Ononugbo
An external background ionization radiation was carried out in Our Lady Health of the sick hospital, Colworth Medical and Olive Tree Medical Diagnostics Port Harcourt. The background radiation reading was taken using the radiation alert meter (Digilert 200). The estimated value for the excess lifetime cancer risk from the three hospitals are lower than the world average, also the annual effective dose equivalent from Our Lady Health of the sick hospital, Colworth Medical Centre and Olive three medical center are lower than the world accepted value. The average absorbed dose rates are higher than the world accepted value which is 84nGy/h. the average exposure rate from the three hospitals is lower than the world accepted value which is 0.013mR/h. the absorbed dose rate exceeded the safe limit for the general public.
{"title":"Evaluation of Health Risk Due to Exposure to Radiation in Some Hospitals in Rivers State","authors":"A. Bubu, C. Ononugbo","doi":"10.9734/ajopacs/2023/v11i1194","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i1194","url":null,"abstract":"An external background ionization radiation was carried out in Our Lady Health of the sick hospital, Colworth Medical and Olive Tree Medical Diagnostics Port Harcourt. The background radiation reading was taken using the radiation alert meter (Digilert 200). The estimated value for the excess lifetime cancer risk from the three hospitals are lower than the world average, also the annual effective dose equivalent from Our Lady Health of the sick hospital, Colworth Medical Centre and Olive three medical center are lower than the world accepted value. The average absorbed dose rates are higher than the world accepted value which is 84nGy/h. the average exposure rate from the three hospitals is lower than the world accepted value which is 0.013mR/h. the absorbed dose rate exceeded the safe limit for the general public.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82777932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-21DOI: 10.9734/ajopacs/2023/v11i1193
J. N. Nwauzor, A. Ekpunobi, A. D. Babalola
In this study iron oxide (Fe2O3) nanoparticle samples was prepared using mechanical grinding method. The optical properties were studied using UV-Vis spectrophotometer within a range of 200-1100nm. The micro and crystalline size of the nanoparticle were studied using x-ray diffractometer (XRD) and scanning electron microscopy (SEM). The compositional analysis was carried out using energy dispersive x-ray spectroscopy (EDXS). Observation of the electrical properties of the nanoparticle was carried out using an electrical four-point probe system. The XRD pattern in the 2θ range from 20 to 700 revealed that iron oxide had a rhombohedral structure. The SEM result showed that the nanoparticles were well dispersed and had a uniform crystalline structure. The EDXS results showed the elemental analysis of the nanoparticles under consideration. Iron oxide nanoparticles had elemental composition of oxygen, iron, titanium and carbon. The atomic and weight concentration of iron was 14.19 and 30.89%. The four-point probe electrical resistivity result shows that iron oxide nanoparticles had a sheet resistance of 9.8x106Ώ/sq. The optical result made it known that iron oxide nanoparticles possessed a high transmittance, also iron oxide nanoparticles displayed a low reflectance and moderate absorbance. Finally, the bandgap energy of Fe2O3 dispersed in ethanol was found to be 2.74 eV. The Band gap of Fe2O3 dispersed in distilled water is 2.98 eV.
{"title":"Processing and Characterization of Iron Oxide Nanoparticle Produced by Ball Milling Technique","authors":"J. N. Nwauzor, A. Ekpunobi, A. D. Babalola","doi":"10.9734/ajopacs/2023/v11i1193","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i1193","url":null,"abstract":"In this study iron oxide (Fe2O3) nanoparticle samples was prepared using mechanical grinding method. The optical properties were studied using UV-Vis spectrophotometer within a range of 200-1100nm. The micro and crystalline size of the nanoparticle were studied using x-ray diffractometer (XRD) and scanning electron microscopy (SEM). The compositional analysis was carried out using energy dispersive x-ray spectroscopy (EDXS). Observation of the electrical properties of the nanoparticle was carried out using an electrical four-point probe system. The XRD pattern in the 2θ range from 20 to 700 revealed that iron oxide had a rhombohedral structure. The SEM result showed that the nanoparticles were well dispersed and had a uniform crystalline structure. The EDXS results showed the elemental analysis of the nanoparticles under consideration. Iron oxide nanoparticles had elemental composition of oxygen, iron, titanium and carbon. The atomic and weight concentration of iron was 14.19 and 30.89%. The four-point probe electrical resistivity result shows that iron oxide nanoparticles had a sheet resistance of 9.8x106Ώ/sq. The optical result made it known that iron oxide nanoparticles possessed a high transmittance, also iron oxide nanoparticles displayed a low reflectance and moderate absorbance. Finally, the bandgap energy of Fe2O3 dispersed in ethanol was found to be 2.74 eV. The Band gap of Fe2O3 dispersed in distilled water is 2.98 eV.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86296488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-08DOI: 10.9734/ajopacs/2023/v11i1192
Pape Tamsir Ndiaye, M. Ndiaye, Goumbo Ndiaye, O. Thiam, M. Sow, C. Mbow
We have examined film condensation in a channel whose walls are covered with porous media numerically. The transfers in the porous medium and the liquid film are respectively described by the Darcy-Brinkman-Forchheimer model and the equations of the hydrodynamic and thermal boundary layers and are solved by the decentered implicit finite difference method and the iterative Gauss-Seidel method. After validating, the influence of the thickness of the porous layer on the longitudinal velocity and the temperature profiles in both media (pure liquid and porous medium), the thickness of the liquid film, the local Nusselt number and the lengths of entry have been studied. We note that an increase in the thickness of the porous layer increases the friction and decreases the contact of the fluid with the cold plate and allows a decrease in the longitudinal velocity and an increase in the temperatures in the porous medium and the pure liquid, a decrease liquid film thickness (disadvantaged condensation) and increases the local Nusselt number and also an increase in the length of entry. The increase in length of entry is quasi-linear. The sensitivity of condensation to a change in thickness of the porous layer is constant.
{"title":"Influence of Thickness of the Porous Layer on Thin Film Condensation in Forced Convection in a Canal Whose Walls are Covered with a Porous Material: Determination of Lengths of Entry","authors":"Pape Tamsir Ndiaye, M. Ndiaye, Goumbo Ndiaye, O. Thiam, M. Sow, C. Mbow","doi":"10.9734/ajopacs/2023/v11i1192","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i1192","url":null,"abstract":"We have examined film condensation in a channel whose walls are covered with porous media numerically. The transfers in the porous medium and the liquid film are respectively described by the Darcy-Brinkman-Forchheimer model and the equations of the hydrodynamic and thermal boundary layers and are solved by the decentered implicit finite difference method and the iterative Gauss-Seidel method. \u0000After validating, the influence of the thickness of the porous layer on the longitudinal velocity and the temperature profiles in both media (pure liquid and porous medium), the thickness of the liquid film, the local Nusselt number and the lengths of entry have been studied. \u0000We note that an increase in the thickness of the porous layer increases the friction and decreases the contact of the fluid with the cold plate and allows a decrease in the longitudinal velocity and an increase in the temperatures in the porous medium and the pure liquid, a decrease liquid film thickness (disadvantaged condensation) and increases the local Nusselt number and also an increase in the length of entry. The increase in length of entry is quasi-linear. The sensitivity of condensation to a change in thickness of the porous layer is constant.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90061206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-05DOI: 10.9734/ajopacs/2023/v11i1191
Vincent Zoma, B. Kaboré, G. W. P. Ouedraogo, J. Compaoré, S. Kam
In this work, we present a numerical study of the thermal behavior of a hollow block with or without phase change material (PCM) in the Sahelian zone. The PCMs used in this study are RT27 paraffin and hydrated salt with a melting temperature of 27°C and 29.9°C respectively and a latent heat of fusion of 179kJ/kg and 184kJ/kg. The equations obtained were adimensionalized then discretized by the finite element method and solved on the COMSOL software. We were first interested in the study of the thermal phase shift, the damping and the evolution of the temperature at the level of the internal wall. In a second phase, we conducted a comparative study between hollow block containing PCM and other construction materials (adobe, BTC and BLT) used in Burkina Faso. The numerical results obtained show that the temperature of the internal wall of a hollow block containing RT27 is lower than that of a hollow block without PCM, hollow block containing hydrated salt, BTC, BLT and adobe with respectively a temperature difference of 8.354°C; 3.39°C; 5.79°C; 3.97°C and 3.92°C and the difference in terms of phase shift is 1h18min, 6min, 24min, 42min and 6min for the hollow block containing RT27, the hollow block containing hydrated salt, BTC, BLT and adobe. Therefore, the integration of PCM in building materials increases their thermal inertia.
{"title":"Numerical Study of the Thermal Behavior of a Hollow Block with Phase Change Materials (PCM) in the Sahelian Zone","authors":"Vincent Zoma, B. Kaboré, G. W. P. Ouedraogo, J. Compaoré, S. Kam","doi":"10.9734/ajopacs/2023/v11i1191","DOIUrl":"https://doi.org/10.9734/ajopacs/2023/v11i1191","url":null,"abstract":"In this work, we present a numerical study of the thermal behavior of a hollow block with or without phase change material (PCM) in the Sahelian zone. \u0000The PCMs used in this study are RT27 paraffin and hydrated salt with a melting temperature of 27°C and 29.9°C respectively and a latent heat of fusion of 179kJ/kg and 184kJ/kg. The equations obtained were adimensionalized then discretized by the finite element method and solved on the COMSOL software. We were first interested in the study of the thermal phase shift, the damping and the evolution of the temperature at the level of the internal wall. In a second phase, we conducted a comparative study between hollow block containing PCM and other construction materials (adobe, BTC and BLT) used in Burkina Faso. \u0000The numerical results obtained show that the temperature of the internal wall of a hollow block containing RT27 is lower than that of a hollow block without PCM, hollow block containing hydrated salt, BTC, BLT and adobe with respectively a temperature difference of 8.354°C; 3.39°C; 5.79°C; 3.97°C and 3.92°C and the difference in terms of phase shift is 1h18min, 6min, 24min, 42min and 6min for the hollow block containing RT27, the hollow block containing hydrated salt, BTC, BLT and adobe. \u0000Therefore, the integration of PCM in building materials increases their thermal inertia.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87036222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.9734/ajopacs/2022/v10i4188
Tammy Morrison, Erefama Ekine Esonanjor
Aim: A subsurface geotechnical investigation was carried out for the purpose of establishing the depth of competent soil for foundation design and construction of a one-storey building. Study Design: The study was aimed at assessing the subsoil competence for a foundation design in the Eastern Niger Delta using engineering geology and geotechnics. Place and Duration of Study: The research was conducted in three locations along the Rumuokwuta axis of Port Harcourt (the eastern Niger Delta) between April and September 2019. Method: The study involved both field sampling and laboratory analysis. This involved soil boring for the retrieval of disturbed and relatively undisturbed samples for analysis, which involves grain size analysis, the Atterberg limits, moisture content, and unit weights. Also, Oedometer consolidation Oedometer and undrained, unconsolidated triaxial tests were carried out. Results: The study revealed two main stratigraphic layers that are mostly fine within the shallow foundation level (0.0–3.0m). From the results, the soil exhibited the following geotechnical properties: liquid limit (41-46%), plastic limit (21-23%), plasticity index (18-24%), and moisture content range (20.6-24.7%). The undrained cohesion value is 55 kPa, and the average frictional angle is 5o. The coefficients of compression (Mv) and consolidation (Cv) were 0.20 m2 /MN and 40.7 m2/yr, respectively. Conclusion: With the moderate bearing and settlement values within the shallow foundation level, the feasibility of adopting a shallow foundation for the purposed structure is tolerable. A shallow foundation (1.4m minimum) with an allowable bearing pressure of 100 kPa is therefore recommended.
{"title":"Evaluation of Subsoil Competence for Foundation Design Design in Rumuokwuta, Port Harcourt, Eastern Niger Delta","authors":"Tammy Morrison, Erefama Ekine Esonanjor","doi":"10.9734/ajopacs/2022/v10i4188","DOIUrl":"https://doi.org/10.9734/ajopacs/2022/v10i4188","url":null,"abstract":"Aim: A subsurface geotechnical investigation was carried out for the purpose of establishing the depth of competent soil for foundation design and construction of a one-storey building. \u0000Study Design: The study was aimed at assessing the subsoil competence for a foundation design in the Eastern Niger Delta using engineering geology and geotechnics. \u0000Place and Duration of Study: The research was conducted in three locations along the Rumuokwuta axis of Port Harcourt (the eastern Niger Delta) between April and September 2019. \u0000Method: The study involved both field sampling and laboratory analysis. This involved soil boring for the retrieval of disturbed and relatively undisturbed samples for analysis, which involves grain size analysis, the Atterberg limits, moisture content, and unit weights. Also, Oedometer consolidation Oedometer and undrained, unconsolidated triaxial tests were carried out. \u0000Results: The study revealed two main stratigraphic layers that are mostly fine within the shallow foundation level (0.0–3.0m). From the results, the soil exhibited the following geotechnical properties: liquid limit (41-46%), plastic limit (21-23%), plasticity index (18-24%), and moisture content range (20.6-24.7%). The undrained cohesion value is 55 kPa, and the average frictional angle is 5o. The coefficients of compression (Mv) and consolidation (Cv) were 0.20 m2 /MN and 40.7 m2/yr, respectively. \u0000Conclusion: With the moderate bearing and settlement values within the shallow foundation level, the feasibility of adopting a shallow foundation for the purposed structure is tolerable. A shallow foundation (1.4m minimum) with an allowable bearing pressure of 100 kPa is therefore recommended.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81306965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.9734/ajopacs/2022/v10i4190
Gagnon Koffi Apédanou, K. N’wuitcha, Y. Laré, K. Napo
A numerical study of the natural heat and mass transfer in a cavity with a straight isoscele cross-section containing air is made in this paper. The two inclined side walls are kept in natural convection with the surrounding environment. The upper horizontal wall is subjected to a heat flux of constant density, while the lower one is adiabatic. Under the Boussinesq assumption, the thermodynamic conditions are numerically studied using the unsteady convection equations formulated as a secondary variable of vorticity and a stream function, energy and moisture. The system of equations discretised by the implicit finite difference method is solved by the Thomas algorithm. The results show a flow structure, isotherms and isohumidities dependent on the study parameters. Thus, on one hand, an increase in the inclination angle of the walls is accompanied by an increase in the velocity of the fluid. On the other hand, an increase in the aspect ratio or Lewis number leads to a decrease in the fluid’s velocity. The average Nusselt number, which is independent of the Rayleigh number, increases slightly as the inclination angle of the walls decreases. The increase of the Lewis number results in the decrease of the flow velocity components values. It is observed that the maxima values of velocity components were reached for Rayleigh number equal to 7.103.
{"title":"Numerical Study of Natural Solutal Convection in an Isoscele Trapezoidal Cavity","authors":"Gagnon Koffi Apédanou, K. N’wuitcha, Y. Laré, K. Napo","doi":"10.9734/ajopacs/2022/v10i4190","DOIUrl":"https://doi.org/10.9734/ajopacs/2022/v10i4190","url":null,"abstract":"A numerical study of the natural heat and mass transfer in a cavity with a straight isoscele cross-section containing air is made in this paper. The two inclined side walls are kept in natural convection with the surrounding environment. The upper horizontal wall is subjected to a heat flux of constant density, while the lower one is adiabatic. Under the Boussinesq assumption, the thermodynamic conditions are numerically studied using the unsteady convection equations formulated as a secondary variable of vorticity and a stream function, energy and moisture. The system of equations discretised by the implicit finite difference method is solved by the Thomas algorithm. The results show a flow structure, isotherms and isohumidities dependent on the study parameters. Thus, on one hand, an increase in the inclination angle of the walls is accompanied by an increase in the velocity of the fluid. On the other hand, an increase in the aspect ratio or Lewis number leads to a decrease in the fluid’s velocity. The average Nusselt number, which is independent of the Rayleigh number, increases slightly as the inclination angle of the walls decreases. The increase of the Lewis number results in the decrease of the flow velocity components values. It is observed that the maxima values of velocity components were reached for Rayleigh number equal to 7.103.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74898636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-31DOI: 10.9734/ajopacs/2022/v10i4189
K. N’wuitcha, Ouro-Djobo Essoavana Samah, Yendouban Kolani, M. Banna, B. Zeghmati
In the current energy context, geothermal systems are highly developed in the building field. Among these interesting systems on the energy plan, one finds in particular the earth-to-air heat exchanger commonly called ‘Canadian or Provençal well’. It consists of tubes buried in which the ambient air is pushed in order to be refreshed in contact with the ground whose temperature is quasi-constant throughout the year. In this work, a study of the performance of an earth-to-air heat exchanger was undertaken by means of numerical modeling of heat exchange by forced convection in a buried tube. The transfer equations in the tube are discretized using the finite volume method in turbulent regime and solved using the Thomas algorithm. For the determination of the ground temperature, the model of the semi-infinite mass subjected to a periodic excitation was adopted. The soil temperature was used as a boundary condition for the buried tube. The results show that the interest of the earth-to-air heat exchanger is major, since it improves throughout the year, the thermal conditions sought. It intervenes in an effective way on the damping of the thermal amplitudes in the building. The variation of the diameter and the length of earth-to-air heat exchanger does not influence notably the distribution of the streamlines and isotherms but affect significantly the values of stream function and temperature inside de tube of the earth-to-air heat exchanger. When diameter of the pipe increases, the outlet temperature increases. The increase of the length of the earth-to-air heat exchanger leads to the isotherms increase as a result of the intensification of heat exchange between the walls and the convective jet. The temperature in the air outlet compartment is lower as the length of the earth-to-air exchanger increases.
{"title":"Contribution of the Provençal Well for the Improvement of the Thermal Comfort in the Building in Turbulent Regime","authors":"K. N’wuitcha, Ouro-Djobo Essoavana Samah, Yendouban Kolani, M. Banna, B. Zeghmati","doi":"10.9734/ajopacs/2022/v10i4189","DOIUrl":"https://doi.org/10.9734/ajopacs/2022/v10i4189","url":null,"abstract":"In the current energy context, geothermal systems are highly developed in the building field. Among these interesting systems on the energy plan, one finds in particular the earth-to-air heat exchanger commonly called ‘Canadian or Provençal well’. It consists of tubes buried in which the ambient air is pushed in order to be refreshed in contact with the ground whose temperature is quasi-constant throughout the year. In this work, a study of the performance of an earth-to-air heat exchanger was undertaken by means of numerical modeling of heat exchange by forced convection in a buried tube. The transfer equations in the tube are discretized using the finite volume method in turbulent regime and solved using the Thomas algorithm. For the determination of the ground temperature, the model of the semi-infinite mass subjected to a periodic excitation was adopted. The soil temperature was used as a boundary condition for the buried tube. \u0000The results show that the interest of the earth-to-air heat exchanger is major, since it improves throughout the year, the thermal conditions sought. It intervenes in an effective way on the damping of the thermal amplitudes in the building. The variation of the diameter and the length of earth-to-air heat exchanger does not influence notably the distribution of the streamlines and isotherms but affect significantly the values of stream function and temperature inside de tube of the earth-to-air heat exchanger. When diameter of the pipe increases, the outlet temperature increases. The increase of the length of the earth-to-air heat exchanger leads to the isotherms increase as a result of the intensification of heat exchange between the walls and the convective jet. The temperature in the air outlet compartment is lower as the length of the earth-to-air exchanger increases.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88710020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-16DOI: 10.9734/ajopacs/2022/v10i4187
Noufou Bagaya, Issaka Ou´edraogo, Windé Nongué Daniel Koumbem, Younoussa Moussa Bald´e, S. Diop, S. Kam
This study seeks to propose a new model of hearth for the consumption of biogas produced by a biodigester of 4 m-3. The cylindrical furnace is used to heat an empty pot for 3 hours. To do this, the system is subdivided into two sub-systems, the first is the flame, which heats the bottom of the pot. The latter is the second hottest point. The developed network is composed of 8 isothermal points, interconnected by thermal resistances, each of which represents a particular type of heat transfer mode. The resolution of the system required 8 differential equations. The modeling allowed us to appreciate the temperatures governing the system. The experimental study proves an agreement with the model temperatures. Studies show that the cook stvoe’s optimal thickness and height are respectively 18 mm and 09 cm. The heat ide the internal air of the kettle is 2200C and the flame temperature is 9000C. The instantaneous efficiency of the cook stove obtained is 65%. In addition, a validation with literature data to confirm this study with maximmum gap of 5%, therefore its adoption will lead to reducing the consumption of biogas and therefore have a positive impact on the woodcut.
{"title":"Modeling and Validation of Biogas Consumption Prediction in Cook Stove Using a Network Approach","authors":"Noufou Bagaya, Issaka Ou´edraogo, Windé Nongué Daniel Koumbem, Younoussa Moussa Bald´e, S. Diop, S. Kam","doi":"10.9734/ajopacs/2022/v10i4187","DOIUrl":"https://doi.org/10.9734/ajopacs/2022/v10i4187","url":null,"abstract":"This study seeks to propose a new model of hearth for the consumption of biogas produced by a biodigester of 4 m-3. The cylindrical furnace is used to heat an empty pot for 3 hours. To do this, the system is subdivided into two sub-systems, the first is the flame, which heats the bottom of the pot. The latter is the second hottest point. The developed network is composed of 8 isothermal points, interconnected by thermal resistances, each of which represents a particular type of heat transfer mode. The resolution of the system required 8 differential equations. The modeling allowed us to appreciate the temperatures governing the system. The experimental study proves an agreement with the model temperatures. Studies show that the cook stvoe’s optimal thickness and height are respectively 18 mm and 09 cm. The heat ide the internal air of the kettle is 2200C and the flame temperature is 9000C. The instantaneous efficiency of the cook stove obtained is 65%. In addition, a validation with literature data to confirm this study with maximmum gap of 5%, therefore its adoption will lead to reducing the consumption of biogas and therefore have a positive impact on the woodcut.","PeriodicalId":8541,"journal":{"name":"Asian Journal of Physical and Chemical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76702517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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