Energy sustainability is becoming central nowadays, especially in South Africa due to electricity blackouts. This article embarks on clean alternative energy based-on thermoelectricity with focus on thermoelectric cooler (TEC). However, in practice, a TEC requires heatsinks or heat-exchangers to function properly but heatsinks also introduce thermal resistance which affects its cooling power and efficiency − which must be addressed. As a result, a TEC with heatsinks model based-on dimensional analysis using Matlab / Simulink is examined. The research novel contributions are i) derivation of analytical forms for the TEC dimensionless cold and hot sides temperature and ii) Simulink TEC with heatsinks theoretical model based-on a simplified dimensional analysis, whereby a TEC with heatsinks parameters of interest can be easily simulated to ascertain analytically, numerically and graphically its optimal performance before implementing physically.
{"title":"Simplified Thermoelectric Cooler (TEC) with Heatsinks Modeling and Simulation using Matlab and Simulink based-on Dimensional Analysis","authors":"Nganyang Paul Bayendang, M. Kahn, V. Balyan","doi":"10.2139/ssrn.3900757","DOIUrl":"https://doi.org/10.2139/ssrn.3900757","url":null,"abstract":"Energy sustainability is becoming central nowadays, especially in South Africa due to electricity blackouts. This article embarks on clean alternative energy based-on thermoelectricity with focus on thermoelectric cooler (TEC). However, in practice, a TEC requires heatsinks or heat-exchangers to function properly but heatsinks also introduce thermal resistance which affects its cooling power and efficiency − which must be addressed. As a result, a TEC with heatsinks model based-on dimensional analysis using Matlab / Simulink is examined. The research novel contributions are i) derivation of analytical forms for the TEC dimensionless cold and hot sides temperature and ii) Simulink TEC with heatsinks theoretical model based-on a simplified dimensional analysis, whereby a TEC with heatsinks parameters of interest can be easily simulated to ascertain analytically, numerically and graphically its optimal performance before implementing physically.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81034736","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 : 2021-06-30DOI: 10.15587/2706-5448.2021.235405
V. Royanov, Irina Zakharova
The object of research is the control of the process of formation of a spraying air flow and the transfer of particles of liquid metal from electrodes during arc spraying. One of the problem areas of the arc spraying process is the oxidation of the sprayed metal particles by the oxygen of the air flow during their transportation to the sprayed surface. This leads to the formation of a sufficiently large amount of oxides of chemical elements, which significantly deteriorate the adhesion strength and burn out alloying elements that are necessary to obtain a wear-resistant and corrosion-resistant coating. The suitability and durability of coatings during use depends on the strength of adhesion to the substrate.
In the course of the study, methods were used to determine the adhesion strength of the coating to the base – the Steffens method and methods for studying the microstructure of coatings were taken as the basis. The data was processed and dependencies were plotted.
The proposed method makes it possible to improve the quality of the resulting coating in terms of such an indicator as improvements in chemical composition. And also to influence the chemical composition by controlling the process of transfer of molten metal using a pulsating air flow.
The obtained results of approbation of the method allow us to consider it effective, as evidenced by the quality of the obtained coatings. This is due to the fact that the correctness of the formulation and solution of the problem provided adequate results. In contrast to the existing methods, the proposed one makes it possible to significantly influence the amount of harmful oxygen involved in the formation of a sprayed coating, which makes it possible to obtain a sprayed layer with the required performance characteristics. And also allows to improve its quality without significant capital costs. In addition, the issues of resource and energy saving are being addressed, since the burnout of chemical elements decreases and the air consumption during arc metallization decreases. To solve this problem, a simple design of the pulsator is proposed, which provides the ability to control the spray flow by adjusting the level of overlapping of the holes.
{"title":"Use of Pulsed Spray Airflow for Electric Arc Spraying of Different Types of Wires","authors":"V. Royanov, Irina Zakharova","doi":"10.15587/2706-5448.2021.235405","DOIUrl":"https://doi.org/10.15587/2706-5448.2021.235405","url":null,"abstract":"The object of research is the control of the process of formation of a spraying air flow and the transfer of particles of liquid metal from electrodes during arc spraying. One of the problem areas of the arc spraying process is the oxidation of the sprayed metal particles by the oxygen of the air flow during their transportation to the sprayed surface. This leads to the formation of a sufficiently large amount of oxides of chemical elements, which significantly deteriorate the adhesion strength and burn out alloying elements that are necessary to obtain a wear-resistant and corrosion-resistant coating. The suitability and durability of coatings during use depends on the strength of adhesion to the substrate.<br><br>In the course of the study, methods were used to determine the adhesion strength of the coating to the base – the Steffens method and methods for studying the microstructure of coatings were taken as the basis. The data was processed and dependencies were plotted.<br><br>The proposed method makes it possible to improve the quality of the resulting coating in terms of such an indicator as improvements in chemical composition. And also to influence the chemical composition by controlling the process of transfer of molten metal using a pulsating air flow.<br><br>The obtained results of approbation of the method allow us to consider it effective, as evidenced by the quality of the obtained coatings. This is due to the fact that the correctness of the formulation and solution of the problem provided adequate results. In contrast to the existing methods, the proposed one makes it possible to significantly influence the amount of harmful oxygen involved in the formation of a sprayed coating, which makes it possible to obtain a sprayed layer with the required performance characteristics. And also allows to improve its quality without significant capital costs. In addition, the issues of resource and energy saving are being addressed, since the burnout of chemical elements decreases and the air consumption during arc metallization decreases. To solve this problem, a simple design of the pulsator is proposed, which provides the ability to control the spray flow by adjusting the level of overlapping of the holes.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77777826","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}
This paper presents experimental and numerical investigations on cold-formed steel built-up section beams. The channels with longitudinal stiffeners were brake-pressed from steel sheets with nominal thicknesses of 0.75 and 1.2 mm. First of all, minor axis bending tests were undertaken to explore buckling behaviour of the newly designed built-up open and closed sections. The test setup, experimental procedure, ultimate moments and failure modes were reported. Then, finite element models were developed and validated against the test results. The parametric study incorporating 107 built-up open and closed section flexural members was performed to generate further numerical data over a wide range of sectional configurations and geometric parameters. After that, the comparisons of ultimate moments obtained from experiments and finite element analyses with nominal strengths calculated on the basis of direct strength method (DSM) that provided in the North American Specification and Australian/New Zealand Standard were carried out to evaluate the appropriateness of current design rules for cold-formed steel built-up section beams. It is shown that the codified DSM equations are generally conservative for flexural strength predictions of the built-up open sections, while provide unconservative predictions for the built-up closed sections under minor axis bending.
{"title":"Flexural behaviour of cold-formed steel built-up section members","authors":"Qiu-Yun Li, B. Young","doi":"10.2139/ssrn.3871149","DOIUrl":"https://doi.org/10.2139/ssrn.3871149","url":null,"abstract":"This paper presents experimental and numerical investigations on cold-formed steel built-up section beams. The channels with longitudinal stiffeners were brake-pressed from steel sheets with nominal thicknesses of 0.75 and 1.2 mm. First of all, minor axis bending tests were undertaken to explore buckling behaviour of the newly designed built-up open and closed sections. The test setup, experimental procedure, ultimate moments and failure modes were reported. Then, finite element models were developed and validated against the test results. The parametric study incorporating 107 built-up open and closed section flexural members was performed to generate further numerical data over a wide range of sectional configurations and geometric parameters. After that, the comparisons of ultimate moments obtained from experiments and finite element analyses with nominal strengths calculated on the basis of direct strength method (DSM) that provided in the North American Specification and Australian/New Zealand Standard were carried out to evaluate the appropriateness of current design rules for cold-formed steel built-up section beams. It is shown that the codified DSM equations are generally conservative for flexural strength predictions of the built-up open sections, while provide unconservative predictions for the built-up closed sections under minor axis bending.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87267587","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}
In this paper a new way to define transverse extension modes is introduced in the context of modal analysis of thin-walled members. The new primary transverse extension modes are inspired by the strain distributions of global and distortional modes. The new modes are employed here in the constrained finite strip method. The new modes require some change in the interpolation functions of the semianalytical finite strip method, which change is briefly discussed. The practical advantage of the proposed new transverse extension modes is that the artificial stiffness increase, which is characteristics to constrained analyses, can be compensated by the consideration of the relevant new transverse extension mode(s), as illustrated by numerous proof-of-concept examples in the paper.
{"title":"New transverse extension modes for the constrained finite strip analysis of thin-walled members","authors":"T. Hoang, S. Ádány","doi":"10.2139/ssrn.3867259","DOIUrl":"https://doi.org/10.2139/ssrn.3867259","url":null,"abstract":"In this paper a new way to define transverse extension modes is introduced in the context of modal analysis of thin-walled members. The new primary transverse extension modes are inspired by the strain distributions of global and distortional modes. The new modes are employed here in the constrained finite strip method. The new modes require some change in the interpolation functions of the semianalytical finite strip method, which change is briefly discussed. The practical advantage of the proposed new transverse extension modes is that the artificial stiffness increase, which is characteristics to constrained analyses, can be compensated by the consideration of the relevant new transverse extension mode(s), as illustrated by numerous proof-of-concept examples in the paper.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74574366","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}
The paper reports results of investigations into the effect produced by elastic action of the nodes of the beam grillage on an increase in the critical moment of lateral torsional buckling. Also, the effectiveness of the use of closed section ribs in the grillage nodes for increase in critical load capacity of the coupling beam was examined and compared with that of flat ribs.
{"title":"The Critical Bearing Capacity of Beams in Steel Grillages","authors":"R. Piotrowski","doi":"10.2139/ssrn.3866492","DOIUrl":"https://doi.org/10.2139/ssrn.3866492","url":null,"abstract":"The paper reports results of investigations into the effect produced by elastic action of the nodes of the beam grillage on an increase in the critical moment of lateral torsional buckling. Also, the effectiveness of the use of closed section ribs in the grillage nodes for increase in critical load capacity of the coupling beam was examined and compared with that of flat ribs.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86359441","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}
This paper presents an experimental study on web crippling behaviour of cold-formed steel built-up Isections with circular web holes. The built-up sections were formed by connecting two identical unlipped channels with self-tapping screws. The web hole was located at mid-height of the web and directly beneath the bearing plates. Web crippling tests were conducted on 6 built-up sections without web holes and 19 built-up sections with perforated web under End-Two-Flange and Interior-Two-Flange loading conditions. The web crippling strengths, failure modes and load-displacement curves were reported. The experimental ultimate strengths for specimens without web holes were compared to the nominal strengths predicted from North American Specification, Australian/New Zealand Standard and European Code for cold-formed steel structures. It should be mentioned that the existing international design codes do not have explicit design formula to predict the web crippling strength of cold-formed steel built-up sections with perforated web. Therefore, the test strengths of specimens with perforated web were compared with the strengths derived from the design equations proposed in the literature. It is shown that the design strengths predicted from current design specifications are either conservative or unconservative for the specimens without web holes, while the design equations in the literature are generally unconservative for the specimens with perforated web.
{"title":"Tests of cold-formed steel built-up sections with web holes subjected to web crippling","authors":"Jun-Jun He, B. Young","doi":"10.2139/ssrn.3866507","DOIUrl":"https://doi.org/10.2139/ssrn.3866507","url":null,"abstract":"This paper presents an experimental study on web crippling behaviour of cold-formed steel built-up Isections with circular web holes. The built-up sections were formed by connecting two identical unlipped channels with self-tapping screws. The web hole was located at mid-height of the web and directly beneath the bearing plates. Web crippling tests were conducted on 6 built-up sections without web holes and 19 built-up sections with perforated web under End-Two-Flange and Interior-Two-Flange loading conditions. The web crippling strengths, failure modes and load-displacement curves were reported. The experimental ultimate strengths for specimens without web holes were compared to the nominal strengths predicted from North American Specification, Australian/New Zealand Standard and European Code for cold-formed steel structures. It should be mentioned that the existing international design codes do not have explicit design formula to predict the web crippling strength of cold-formed steel built-up sections with perforated web. Therefore, the test strengths of specimens with perforated web were compared with the strengths derived from the design equations proposed in the literature. It is shown that the design strengths predicted from current design specifications are either conservative or unconservative for the specimens without web holes, while the design equations in the literature are generally unconservative for the specimens with perforated web.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83012805","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}
R. Raikar, Jayesh T. Bhanushali, Nilay Takarkhede, Sejal Shah
Nowadays technology is increasing rapidly, the usage and the implementation of CNC systems in industries and educational institutions are exponentially increasing but at a greater cost. Our main goal is to design a CNC Laser Engraver that is also a compact, cheap and low power unit that is also easy to operate in order to reduce complexity, cost and manual work. The idea of open source laserGRBL – arduino based laser engraver is to use the Open Source LaserGRBL that loads the G-code coordinates of an image that is given by user and sends those coordinates to the arduino which in turn signals the hardware components i.e. stepper-motor and laser to engrave onto the surfaces for example wood, Acrylic or plastic. The engraver will be able to engrave vector graphics in two (X & Y) axes of motion. Most of the engravers are designed in bi-directional movement and square type models. Whereas in this laser engraver, axes movements are mounted on each other and belt driven mechanism is used for engraving. Laser engraver uses a very fine matrix of dots to form images, such that a line may appear continuous to the naked eye, it in fact is a discrete set of points.
{"title":"Open Source LaserGRBL – Arduino Based Laser Engraver","authors":"R. Raikar, Jayesh T. Bhanushali, Nilay Takarkhede, Sejal Shah","doi":"10.2139/ssrn.3866523","DOIUrl":"https://doi.org/10.2139/ssrn.3866523","url":null,"abstract":"Nowadays technology is increasing rapidly, the usage and the implementation of CNC systems in industries and educational institutions are exponentially increasing but at a greater cost. Our main goal is to design a CNC Laser Engraver that is also a compact, cheap and low power unit that is also easy to operate in order to reduce complexity, cost and manual work. The idea of open source laserGRBL – arduino based laser engraver is to use the Open Source LaserGRBL that loads the G-code coordinates of an image that is given by user and sends those coordinates to the arduino which in turn signals the hardware components i.e. stepper-motor and laser to engrave onto the surfaces for example wood, Acrylic or plastic. The engraver will be able to engrave vector graphics in two (X & Y) axes of motion. Most of the engravers are designed in bi-directional movement and square type models. Whereas in this laser engraver, axes movements are mounted on each other and belt driven mechanism is used for engraving. Laser engraver uses a very fine matrix of dots to form images, such that a line may appear continuous to the naked eye, it in fact is a discrete set of points.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82931176","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}
Research into cancer treatments has led to the identification of potential drugs based on metal containing scaffolds. A landmark in history has been established after the finding of cisplatin’s antiproliferative activity. Significant attempts have been cantered on designing new metal-based anticancer agents as well as therapeutic tactics which should target cancer cells without hampering normal cells. Platinum drugs, for instance, cisplatin, carboplatin, and oxaliplatin are prevailing in cancer treatment. However, some major obstacles of these drugs like toxicity, side effects of the drugs along with the generation of drug resistance are causing hindrance for wide clinical usage. Recently, however, an intense effort has been given on the structural optimisation and drug delivery strategy of these drugs. It has focused on either improving or redesigning the existing chemical structure of metal-based compounds with superior protection as well as cytotoxic profile. In this review, an outline is given on recently synthesise metal-based compounds such as Platinum, Ruthenium, Gold and Copper mentioning the limitations of their ancestors besides a new methodology for developing metal-based drugs for the cure of cancer.
{"title":"The Medicinal Chemistry of Metal-Containing Anticancer drugs","authors":"Farjana Afroj","doi":"10.2139/ssrn.3859521","DOIUrl":"https://doi.org/10.2139/ssrn.3859521","url":null,"abstract":"Research into cancer treatments has led to the identification of potential drugs based on metal containing scaffolds. A landmark in history has been established after the finding of cisplatin’s antiproliferative activity. Significant attempts have been cantered on designing new metal-based anticancer agents as well as therapeutic tactics which should target cancer cells without hampering normal cells. Platinum drugs, for instance, cisplatin, carboplatin, and oxaliplatin are prevailing in cancer treatment. However, some major obstacles of these drugs like toxicity, side effects of the drugs along with the generation of drug resistance are causing hindrance for wide clinical usage. Recently, however, an intense effort has been given on the structural optimisation and drug delivery strategy of these drugs. It has focused on either improving or redesigning the existing chemical structure of metal-based compounds with superior protection as well as cytotoxic profile. In this review, an outline is given on recently synthesise metal-based compounds such as Platinum, Ruthenium, Gold and Copper mentioning the limitations of their ancestors besides a new methodology for developing metal-based drugs for the cure of cancer.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85259886","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}
Ming Yang, Junfeng Xu, Honghao Ma, Z. Shen, Bingyuan Zhang, J. Tian
The vortex at the Ta/Fe explosively welded interface is featured by intermediate zone being fully bounded by Ta matrix, which differs from the vortex structures observed in the most bimetallic interfaces. In this work, advanced characterizations and numerical simulations were integrated to establish a detailed evolution model of the special vortex, and the associated governing mechanisms were identified. It was also inferred that the mesoscale cavity and micro cracks within the vortex resulted from geometric hole and extrusion movement that generated during the vortex evolution, respectively. Furthermore, a diversity of metallurgical structure was revealed at the Ta/Fe interface, which did support the deformation path of the interface material observed in the simulations. The insights gathered here benefit to an in-depth comprehension of impact welding.
{"title":"A Special Vortex Formation at the Ta/Fe Interface During Explosive Welding","authors":"Ming Yang, Junfeng Xu, Honghao Ma, Z. Shen, Bingyuan Zhang, J. Tian","doi":"10.2139/ssrn.3854488","DOIUrl":"https://doi.org/10.2139/ssrn.3854488","url":null,"abstract":"The vortex at the Ta/Fe explosively welded interface is featured by intermediate zone being fully bounded by Ta matrix, which differs from the vortex structures observed in the most bimetallic interfaces. In this work, advanced characterizations and numerical simulations were integrated to establish a detailed evolution model of the special vortex, and the associated governing mechanisms were identified. It was also inferred that the mesoscale cavity and micro cracks within the vortex resulted from geometric hole and extrusion movement that generated during the vortex evolution, respectively. Furthermore, a diversity of metallurgical structure was revealed at the Ta/Fe interface, which did support the deformation path of the interface material observed in the simulations. The insights gathered here benefit to an in-depth comprehension of impact welding.","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"2015 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87044139","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 : 2021-04-30DOI: 10.15587/2706-5448.2021.229652
V. Dmytrenko, Yuliia Diachenko
The object of study is natural oils. Lubricating additives based on natural substances – vegetable oils and animal fats – meet the increased requirements for environmental safety of materials used in the drilling process. Consumption of environmentally friendly lubricants is constantly growing and requires an expansion of the raw material base for their production. Therefore today lubricants are important drilling reagents. From the ecological point of view, lubricating additives based on vegetable oils are of the greatest interest. The main physicochemical properties of sunflower and castor vegetable oils and the influence of these lubricating additives on lubricating and rheological characteristics of drilling fluids were investigated. In addition, the main properties of water-clay drilling fluids were investigated and their main parameters were determined according to standard API methods. During the testing of the samples, we took into account, first of all, a shear rate of the filter cake (CFC). It is the value that characterizes the strength of filter cake and is determined by the ratio of strength necessary for the tangential displacement of cyclic load across the cake to its weight. It is the CFC that characterizes the lubricating properties of the samples of solutions with a lubricant additive of a certain concentration that were studied. It is the CFC that characterizes the lubricating properties of the samples of solutions with a lubricant additive of a certain concentration that were studied. Based on the above studies, it can be concluded that the addition of castor oil effectively reduces the coefficient of friction of the filtration crust formed from the studied drilling fluids (fresh, mineralized, and saline). The recommended concentrations of this oil to the drilling fluid are 0.5 %, 1 %, and 5 %. Sunflower oil has an effective effect on the saline solution, less effectively – on the mineralized with an oil concentration of 0.5 %, 3 %, and 5 %. On the basis of the conducted researches the prospects of use of sunflower and castor oils at development of a new compounding of a greasing additive to a drilling mud are defined. Further research is aimed at assessing their lubricity in the drilling fluid at the friction limit «metal-metal». It is planned to repeat the study at the Sticking Tester OFI (USA).
{"title":"The Impact Assessment of Plant Oils on Unctuousity of Drilling Fluids","authors":"V. Dmytrenko, Yuliia Diachenko","doi":"10.15587/2706-5448.2021.229652","DOIUrl":"https://doi.org/10.15587/2706-5448.2021.229652","url":null,"abstract":"The object of study is natural oils.\u0000Lubricating additives based on natural substances – vegetable oils and animal fats – meet the increased requirements for environmental safety of materials used in the drilling process. Consumption of environmentally friendly lubricants is constantly growing and requires an expansion of the raw material base for their production. Therefore today lubricants are important drilling reagents. From the ecological point of view, lubricating additives based on vegetable oils are of the greatest interest.\u0000The main physicochemical properties of sunflower and castor vegetable oils and the influence of these lubricating additives on lubricating and rheological characteristics of drilling fluids were investigated. In addition, the main properties of water-clay drilling fluids were investigated and their main parameters were determined according to standard API methods.\u0000During the testing of the samples, we took into account, first of all, a shear rate of the filter cake (CFC). It is the value that characterizes the strength of filter cake and is determined by the ratio of strength necessary for the tangential displacement of cyclic load across the cake to its weight. It is the CFC that characterizes the lubricating properties of the samples of solutions with a lubricant additive of a certain concentration that were studied. It is the CFC that characterizes the lubricating properties of the samples of solutions with a lubricant additive of a certain concentration that were studied.\u0000Based on the above studies, it can be concluded that the addition of castor oil effectively reduces the coefficient of friction of the filtration crust formed from the studied drilling fluids (fresh, mineralized, and saline). The recommended concentrations of this oil to the drilling fluid are 0.5 %, 1 %, and 5 %. Sunflower oil has an effective effect on the saline solution, less effectively – on the mineralized with an oil concentration of 0.5 %, 3 %, and 5 %.\u0000On the basis of the conducted researches the prospects of use of sunflower and castor oils at development of a new compounding of a greasing additive to a drilling mud are defined. Further research is aimed at assessing their lubricity in the drilling fluid at the friction limit «metal-metal». It is planned to repeat the study at the Sticking Tester OFI (USA).","PeriodicalId":10639,"journal":{"name":"Computational Materials Science eJournal","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91469972","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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