Chemical Engineering and Processing - Process Intensification最新文献

英文中文

Application of a novel hexagonal ultrasonic reactor for intensified crystallization of adipic acid

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110123

Yagna S. Hirpara, Parag R. Gogate

Application of hexagonal ultrasonic reactor for improved crystallization of adipic acid was investigated with response surface methodology (RSM) based parameter optimization to obtain minimum particle size with possible narrow particle size distribution (PSD). Optimized settings were elucidated as 150 W ultrasonic power, 30 min as irradiation time, a duty cycle of 50 %, and an ultrasonic frequency of 22 kHz. The mechanism of particle size reduction under sonication was elucidated to be governed by cavitation-induced shear forces coupled with acoustic streaming and microjet formation. X-ray diffraction analysis indicated minimal structural changes following sonication, suggesting that the primary effect of ultrasound is on particle size modification rather than crystal lattice alteration. FTIR analysis also confirmed unchanged functional groups after the ultrasonic treatment and SEM images show smaller round crystals of adipic acid. Under the optimized ultrasonic conditions, the particle size decreased to approximately 37.4 % of that observed in conventional samples, with a significantly lower energy consumption of roughly 0.00208 kWh per gram of solids. Overall, intensification benefits of the ultrasound were demonstrated in terms of lower size of crystals with better morphology and no adverse effects on the crystal quality.

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引用次数: 0

Low-cost and efficient synthesis of SSZ-35 zeolite through a seed-assisted approach

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110122

Peng Dong , Huanliu Wu , Longhua Luo , Qingyan Cui , Tiesen Li , Jie Shi , Yuanyuan Yue

A low-cost and process-intensified synthesis approach of SSZ-35 zeolite via a seed-assisted method is presented. This approach involves the development of a relatively inexpensive template and the application of seeds to minimize crystallization time and template consumption. Herein, N-Ethyl, N-methyl 2,6-cis-dimethylpiperidinium hydroxide (EMDMPOH) is selected as a template to synthesize SSZ-35 zeolite, and a simplified and optimized scheme for the preparation of such a template is proposed. Specially, the high-purity EMDMPOH is prepared by a sequential alkylation of 2,6-dimethylpiperidine with iodoethane and iodomethane, followed by ion exchange. By employing a seed-assisted strategy, the synthesis process of SSZ-35 zeolite is intensified, resulting in a significant reduction in crystallization time from 7 d to 75 h. Systematic characterizations reveal that the synthesized SSZ-35 zeolite has smaller crystals and larger specific surface area in comparison with the reference sample, leading to enhanced selectivity in n-octane hydroisomerization. Moreover, the cost accounting analysis shows a notable decrease in the synthesis cost of SSZ-35 zeolite by using the synthesis route that combines the simplified process for preparing the template and the reduced amount of template.

{"title":"Low-cost and efficient synthesis of SSZ-35 zeolite through a seed-assisted approach","authors":"Peng Dong , Huanliu Wu , Longhua Luo , Qingyan Cui , Tiesen Li , Jie Shi , Yuanyuan Yue","doi":"10.1016/j.cep.2024.110122","DOIUrl":"10.1016/j.cep.2024.110122","url":null,"abstract":"<div><div>A low-cost and process-intensified synthesis approach of SSZ-35 zeolite via a seed-assisted method is presented. This approach involves the development of a relatively inexpensive template and the application of seeds to minimize crystallization time and template consumption. Herein, N-Ethyl, N-methyl 2,6-cis-dimethylpiperidinium hydroxide (EMDMPOH) is selected as a template to synthesize SSZ-35 zeolite, and a simplified and optimized scheme for the preparation of such a template is proposed. Specially, the high-purity EMDMPOH is prepared by a sequential alkylation of 2,6-dimethylpiperidine with iodoethane and iodomethane, followed by ion exchange. By employing a seed-assisted strategy, the synthesis process of SSZ-35 zeolite is intensified, resulting in a significant reduction in crystallization time from 7 d to 75 h. Systematic characterizations reveal that the synthesized SSZ-35 zeolite has smaller crystals and larger specific surface area in comparison with the reference sample, leading to enhanced selectivity in n-octane hydroisomerization. Moreover, the cost accounting analysis shows a notable decrease in the synthesis cost of SSZ-35 zeolite by using the synthesis route that combines the simplified process for preparing the template and the reduced amount of template.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110122"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization and application of developed green nanocomposite materials for effective grey water purification

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110139

Taisir K. Abbas , Rajaa Hussein , Yahya Ibraheem , Yonuis M. Saleem , Hussaen A H Kahachi , Olaitan Comfort Shekoni , Mika Sillanpää , Qusay F. Alsalhy

This study explores the synthesis and application of a developed green nanocomposite material (GNCZ), combining activated carbon from date pits with zeolite NaA, for the efficient treatment of grey wastewater. Extensive characterization techniques, including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) attached with energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) analyses, were employed to evaluate the material's structural and functional properties. Incorporating nano GAC in the zeolite structure manifested a surface area of 240.27 (m².g⁻¹), with an average pore volume of 0.1929 (cm³.g⁻¹). The results demonstrate that the GNCZ exhibits significant adsorption capacity for various contaminants, with optimal removal efficiency achieved under specific conditions of pH, contact time, and temperature. The adsorption process was determined to follow pseudo-second-order kinetics, with thermodynamic analysis revealing an endothermic and non-spontaneous nature. Challenges related to the presence of competing anions, such as NO₃⁻ and SO₄²⁻, were identified, which can reduce the effectiveness of cation adsorption. However, the material's capacity for multiple regeneration cycles underscores its potential for long-term use in grey wastewater purification systems. This research suggests that, with further optimization, GNCZ could be a sustainable solution for enhancing water quality in agricultural and irrigation contexts.

{"title":"Optimization and application of developed green nanocomposite materials for effective grey water purification","authors":"Taisir K. Abbas , Rajaa Hussein , Yahya Ibraheem , Yonuis M. Saleem , Hussaen A H Kahachi , Olaitan Comfort Shekoni , Mika Sillanpää , Qusay F. Alsalhy","doi":"10.1016/j.cep.2024.110139","DOIUrl":"10.1016/j.cep.2024.110139","url":null,"abstract":"<div><div>This study explores the synthesis and application of a developed green nanocomposite material (GNCZ), combining activated carbon from date pits with zeolite NaA, for the efficient treatment of grey wastewater. Extensive characterization techniques, including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) attached with energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) analyses, were employed to evaluate the material's structural and functional properties. Incorporating nano GAC in the zeolite structure manifested a surface area of 240.27 (m<sup>2</sup>.g<sup>−1</sup>), with an average pore volume of 0.1929 (cm<sup>3</sup>.g<sup>−1</sup>). The results demonstrate that the GNCZ exhibits significant adsorption capacity for various contaminants, with optimal removal efficiency achieved under specific conditions of pH, contact time, and temperature. The adsorption process was determined to follow pseudo-second-order kinetics, with thermodynamic analysis revealing an endothermic and non-spontaneous nature. Challenges related to the presence of competing anions, such as NO₃⁻ and SO₄²⁻, were identified, which can reduce the effectiveness of cation adsorption. However, the material's capacity for multiple regeneration cycles underscores its potential for long-term use in grey wastewater purification systems. This research suggests that, with further optimization, GNCZ could be a sustainable solution for enhancing water quality in agricultural and irrigation contexts.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110139"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Process intensification in reverse flow reactors to boost various industrial applications: A review

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110097

Tristan Cole , Paul Ani , Ahmed Jasim , Zeyad Zeitoun , Joseph Smith

Reverse flow reactors are notable for their dynamic operation under unsteady state conditions, the minimization of energy use, and reduction of harmful greenhouse emissions. The main advantages offered by reverse flow reactors over conventional fixed bed reactors include enhanced reaction rates and reduced waste due to superior mixing and more efficient heat transfer. Sophisticated application of key principles of process intensification has facilitated the use of reverse flow reactors in numerous industrial applications including the oxidation of volatile organic compounds emissions, sulfuric acid production, reduction of NOx emissions from nitric acid production, steam-methane reforming for hydrogen production, and partial oxidation of methane for syngas production. This paper explores the potential of reverse flow reactors to promote sustainable chemical manufacturing processes with a reduced environmental impact across numerous industrial applications.

引用次数: 0

Microwave irradiation as an instrument for tuning of physicochemical and catalytic properties of MFe2O4 spinels

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110138

Petr V. Zemlianskii , Alexander L. Kustov , Maria N. Timofeeva , Leonid M. Kustov

Herein, a literature review on the application of microwave irradiation (MW) for the synthesis of MFe₂O₄ spinels (M: Cu²⁺, Zn²⁺, Mn²⁺, Ni²⁺ and Co²⁺) and oxidation processes of organic pollutants as well as hydrogen production with the use of such catalysts was conducted. The main attention was focused on the tuning of the particle size of spinels and their physicochemical properties by using MW synthesis. The advantages of MW synthesis are shown in comparison with traditional thermal heating (TH). The physicochemical and catalytic properties of MFe₂O₄ spinel obtained under the conditions of MW and TH are compared.

引用次数: 0

Coupling of electrocoagulation and membrane in hybrid and integrated systems for wastewater treatment, focusing on trends of reactor designs, fundamentals, and factors affecting the process: A critical review

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110093

Ahmed J. Aladily, Thamer J. Mohammed, Talib M. Albayati

Separation processes using membrane have increasingly gained attention due to their notable advancements in various areas, including designs, utilizing cutting-edge materials in the fabrication of membrane, production techniques and module engineering. However, it is still limitations especially membrane fouling. One of the promising techniques is coupling electrocoagulation (EC) with membrane to overcome this serious problem and energy saving on the other hand. This paper shows an overview of the typical configuration of integrated EC-membrane system and hybrid EC-membrane system and their applications in industrial wastewater treatment. Different combinations of integrated EC process with microfiltration (EC-MF), ultrafiltration (EC-UF), nanofiltration (EC-NF), and reverse osmosis (EC-RO) with detailed reactor design and case studies were explored. Case studies regarding the application for many sources of wastewater have been demonstrated. Moreover, all main factors affecting EC-membrane process such as; electrode material, inter -electrode distance, current Density, shape of the electrode, electrode arrangement, initial pH, concentration of anions, electrolyte conductivity, EC Time, agitation speed, type of power supply, operating temperature, and pollutant initial concentration were studied. Cost analysis equations also included. The critical analysis and recommendations presented in this review paper will significantly enhance the scientific understanding of the readers.

{"title":"Coupling of electrocoagulation and membrane in hybrid and integrated systems for wastewater treatment, focusing on trends of reactor designs, fundamentals, and factors affecting the process: A critical review","authors":"Ahmed J. Aladily, Thamer J. Mohammed, Talib M. Albayati","doi":"10.1016/j.cep.2024.110093","DOIUrl":"10.1016/j.cep.2024.110093","url":null,"abstract":"<div><div>Separation processes using membrane have increasingly gained attention due to their notable advancements in various areas, including designs, utilizing cutting-edge materials in the fabrication of membrane, production techniques and module engineering. However, it is still limitations especially membrane fouling. One of the promising techniques is coupling electrocoagulation (EC) with membrane to overcome this serious problem and energy saving on the other hand. This paper shows an overview of the typical configuration of integrated EC-membrane system and hybrid EC-membrane system and their applications in industrial wastewater treatment. Different combinations of integrated EC process with microfiltration (EC-MF), ultrafiltration (EC-UF), nanofiltration (EC-NF), and reverse osmosis (EC-RO) with detailed reactor design and case studies were explored. Case studies regarding the application for many sources of wastewater have been demonstrated. Moreover, all main factors affecting EC-membrane process such as; electrode material, inter -electrode distance, current Density, shape of the electrode, electrode arrangement, initial pH, concentration of anions, electrolyte conductivity, EC Time, agitation speed, type of power supply, operating temperature, and pollutant initial concentration were studied. Cost analysis equations also included. The critical analysis and recommendations presented in this review paper will significantly enhance the scientific understanding of the readers.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110093"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visualization study on temporal regime transition of multicomponent subcooled flow in microchannel

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110091

Jia-hui Shi , Shi-jiao Li , Sheng-lin Yan , Zheng-hong Luo

Researching the regime transition of the subcooled flow is essential for designing high-performance heat exchangers. A high-speed camera platform is built to study the bubble behavior of the subcooled boiling of a water-ethanol mixture in a microchannel. Simultaneous synchronisation of thermodynamic transient characterisation and high speed flow visualisation. The flow in the microchannel can be divided into single-phase convection, isolated bubble, bubbly flow, and slug flow regions. The combination of micro-channel and multi-component coolant along with keeping the subcooled boiling within the bubbly flow region can improve the heat transfer performance. The wall effect in the microchannel will enhance the bubble-induced heat transfer and result in a reduced heat transfer performance under higher inlet velocity conditions. Compared with lower velocity of 0.05 m/s, the bubble departure frequency for higher velocity of 0.15 m/s decreased by a maximum of 2 times in the bubbly flow region. The heat transfer coefficient for the bubbly flow regime is found to be universally proportional to the void fraction for all conditions analysed in this paper. Hence, the manners that are beneficial for void fraction improvement can be utilized to regulate the heat transfer coefficient of the microchannel within the bubbly flow regime.

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引用次数: 0

Removal of Cr(VI) by coupled adsorption and photocatalytic degradation based on Ag/ZIF-8/PVDF membrane

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110120

Chunyan Chen , Jiancai Yue , Jian Zhou , Qian Liu , Yaling Tang , Chunlin Chen , Guoqing Xiao

In order to reduce the hazard of the heavy metal chromium, the reduction of Cr from Cr(VI) to Cr(III) for further removal was applied in this study. ZIF-8 modified with Ag was used as the photo-catalyst, and adsorption and degradation were further enhanced by deep penetration through in situ growth of Ag/ZIF-8 in the pores of polyvinylidene fluoride (PVDF) membrane. The composite Ag/ZIF-8/PVDF membrane was characterized by XRD, BET, SEM-EDS, UV–Vis and XPS, and the results proved that the nanoparticles of ZIF-8 and Ag were uniformly distributed inside the membrane pores. The removal efficiency of Cr(VI) was enhanced by 78 % after modification of Ag nanoparticles on the ZIF-8 surface, and further enhanced by 68 % after loading the composite particles (Ag/ZIF-8) into the PVDF membrane. Moreover, the removal mechanism was investigated by free radical trapping experiments, and the results showed that O₂·^- was the main factor in the photo-catalytic process, followed by ·OH. The results indicated that enhancement of coupled adsorption-degradation process by deep permeation is a feasible approach to improve the heavy metal removal performance due to the dispersive and domain-limiting effects of membrane pores. Ag/ZIF-8/PVDF material is expected to be applied in the field of practical Cr(VI)-containing industrial wastewater treatment.

{"title":"Removal of Cr(VI) by coupled adsorption and photocatalytic degradation based on Ag/ZIF-8/PVDF membrane","authors":"Chunyan Chen , Jiancai Yue , Jian Zhou , Qian Liu , Yaling Tang , Chunlin Chen , Guoqing Xiao","doi":"10.1016/j.cep.2024.110120","DOIUrl":"10.1016/j.cep.2024.110120","url":null,"abstract":"<div><div>In order to reduce the hazard of the heavy metal chromium, the reduction of Cr from Cr(VI) to Cr(III) for further removal was applied in this study. ZIF-8 modified with Ag was used as the photo-catalyst, and adsorption and degradation were further enhanced by deep penetration through in situ growth of Ag/ZIF-8 in the pores of polyvinylidene fluoride (PVDF) membrane. The composite Ag/ZIF-8/PVDF membrane was characterized by XRD, BET, SEM-EDS, UV–Vis and XPS, and the results proved that the nanoparticles of ZIF-8 and Ag were uniformly distributed inside the membrane pores. The removal efficiency of Cr(VI) was enhanced by 78 % after modification of Ag nanoparticles on the ZIF-8 surface, and further enhanced by 68 % after loading the composite particles (Ag/ZIF-8) into the PVDF membrane. Moreover, the removal mechanism was investigated by free radical trapping experiments, and the results showed that O<sub>2</sub>·<sup>-</sup> was the main factor in the photo-catalytic process, followed by ·OH. The results indicated that enhancement of coupled adsorption-degradation process by deep permeation is a feasible approach to improve the heavy metal removal performance due to the dispersive and domain-limiting effects of membrane pores. Ag/ZIF-8/PVDF material is expected to be applied in the field of practical Cr(VI)-containing industrial wastewater treatment.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110120"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermo-economic optimization for the advanced material selection of fins and heat sinks

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110109

Hulusi Delibaş, İbrahim Halil Yılmaz

Fins are widely used thermal elements that help transport heat away from a hot surface by increasing the surface area and volume of cooling fluid that flows through them. The functional material selected for these elements is critical for accomplishing efficient heat removal at a low cost. Fin profile, material properties, surface properties, raw material cost, and manufacturing cost are decisive in selecting competitive materials from a holistic perspective. This study has presented two novel material indices for effectively selecting fin and contact heat sink materials. A guiding methodology has been proposed involving both material cost and applicable manufacturing processes for candidate materials. A cost model is proposed to compare manufacturing processes, and production characteristics for varying fin profiles are also investigated. Results show that although die casting is the most economical process among all processes and can produce almost any fin shape, hot forming processes like extrusion and forging allow implementing fin materials with 90.2−98.1% higher thermal conductivity. Beryllia alloys and aluminum nitrides with relatively higher thermal conductivity, ranging between 60−330 W/m∙°C, are preferable for contact heat sinks.

{"title":"Thermo-economic optimization for the advanced material selection of fins and heat sinks","authors":"Hulusi Delibaş, İbrahim Halil Yılmaz","doi":"10.1016/j.cep.2024.110109","DOIUrl":"10.1016/j.cep.2024.110109","url":null,"abstract":"<div><div>Fins are widely used thermal elements that help transport heat away from a hot surface by increasing the surface area and volume of cooling fluid that flows through them. The functional material selected for these elements is critical for accomplishing efficient heat removal at a low cost. Fin profile, material properties, surface properties, raw material cost, and manufacturing cost are decisive in selecting competitive materials from a holistic perspective. This study has presented two novel material indices for effectively selecting fin and contact heat sink materials. A guiding methodology has been proposed involving both material cost and applicable manufacturing processes for candidate materials. A cost model is proposed to compare manufacturing processes, and production characteristics for varying fin profiles are also investigated. Results show that although die casting is the most economical process among all processes and can produce almost any fin shape, hot forming processes like extrusion and forging allow implementing fin materials with 90.2−98.1% higher thermal conductivity. Beryllia alloys and aluminum nitrides with relatively higher thermal conductivity, ranging between 60−330 W/m∙°C, are preferable for contact heat sinks.</div></div>","PeriodicalId":9929,"journal":{"name":"Chemical Engineering and Processing - Process Intensification","volume":"208 ","pages":"Article 110109"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation on the aerodynamic noise and heat transfer characteristics of continuous helical channels with tube bundles

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification

Pub Date : 2025-02-01 DOI: 10.1016/j.cep.2024.110088

Yiping Cao , Linghong Tang , Wei Li , Shenguan Xu , Min Zeng , Kai Zhao

The demand for heat transfer in various industries has been growing rapidly in recent years, which creates severe demands on heat exchangers with high efficiency. The development of low-noise level heat exchangers is critical for submarines and other highly stealthy equipment. Based on the flow properties in the shell-side of shell and tube heat exchanger with continuous helical baffles, the fully and confined helical channels with single tube and tube bundles are established in this paper. Computational fluid dynamics and Aero-acoustic theory are combined to examine the heat transfer and flow noise propagation mechanism inside the helical channels. The results show that the helical channel with helix angle β = 40° exhibits the best overall performance for both single tube and tube bundles. This configuration not only achieves higher heat transfer efficiency but also maintains lower sound pressure levels. As the Reynolds number increases, the pressure drops, the Nusselt number and the sound pressure level all increase. The helical flow within the helix channels contributes to improving the heat transfer performance. The heat transfer performance is enhanced by 2.8∼22.0 % compared with the straight channel. Notably, the maximum sound pressure level observed in the helical channel at a helix angle of β = 40°, which registers at 69.22 dB, lies intermediate to the values recorded for the straight channels and other helical channels. The research can not only highlight the low-noise advantages of helical baffles but also offer new design guidance for noise and vibration suppression in heat exchangers.

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