The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Yanzhong Li - One of the best experts on this subject based on the ideXlab platform.
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layer pattern Thermal Design and optimization for multistream plate fin heat exchangers a review
Renewable & Sustainable Energy Reviews, 2016Co-Authors: Zhe Wang, Yanzhong LiAbstract:Cryogenic processes involve air separation and liquefaction. To reduce energy consumption in these processes, many compact and efficient equipments that can handle fluid heat transfer have been developed. Of these, a multistream plate-fin heat exchanger is one of the best solutions. Studies of plate-fin heat exchangers are currently focusing on four areas: heat transfer calculation, surface analysis, flow resistance and Design optimization. It is also important to optimize the layer patterns Design of multistream plate-fin heat exchangers. Several techniques have been proposed for this purpose thus far; however, most of these are based on qualitative or trial-and-error approaches. Therefore, no universally accepted methodology exists Designing for the layer pattern of multistream plate-fin heat exchangers. This article starts by reviewing traditional Design approaches for multistream plate-fin heat exchangers and then focuses on the development of layer pattern Design methods. It highlights three types of Thermal Design and evaluation criteria. It then discusses some suggestions and new methods for the optimization of the layer pattern Design that have emerged in recent years. Further, newly emerging intelligent heuristic algorithms for optimizing the layer pattern Thermal Design are discussed. In addition to these basic Design methodologies, the “layer pattern ring model” and “dual objective function” optimization methods developed by the author’s research team are discussed. Finally, the status of this research area is summarized, and emerging trends are noted.
Hamdi E Ahmed - One of the best experts on this subject based on the ideXlab platform.
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optimization of Thermal Design of heat sinks a review
International Journal of Heat and Mass Transfer, 2018Co-Authors: Hamdi E Ahmed, B H Salman, Sh A Kherbeet, Mirghani Ishak AhmedAbstract:Abstract Heat sinks are a kind of heat exchangers used for cooling the electronic devices due to the simplicity of fabrication, low cost, and reliability of heat dissipation. The extended surfaces from the heat sinks are either flat-plate fins or pins fins shapes. In the last decades, intensive attentions were spent on miniaturizing the electronic devices because of the high sophisticated micro- and nano-technology development. But the heat dissipation is still the major problem of enhancing the Thermal performance the heat sink. In this article, a comprehensive review is carried out on the methods used for optimizing the hydroThermal Design of heat sinks. Therefore, available investigations regarding the passive and active techniques utilized for enhancing the heat removal from heat sinks by modifying either the solid domain or fluid domain are covered. The purpose of this study is to summarize the investigational efforts spent for developing the Thermal performance of the heat sinks, limitations, and unsolved proposed solutions.
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optimum Thermal Design of triangular trapezoidal and rectangular grooved microchannel heat sinks
International Communications in Heat and Mass Transfer, 2015Co-Authors: Hamdi E Ahmed, Mirghani Ishak AhmedAbstract:Abstract A three-dimensional numerical simulation is conducted to investigate the effect of geometrical parameters on laminar water flow and forced convection heat transfer characteristics in grooved microchannel heat sink (GMCHS). Four geometry variables which are; the depth, tip length, pitch and orientation of the cavities are taken into account in order to optimize the aluminum heat sink Design. These geometric parameters could change the cavity shape from triangular to trapezoidal and then to rectangular shape. The governing and energy equations are solved using the finite volume method (FVM). The performance of GMCHS is evaluated in terms of Nusselt number ratio, Thermal/hydraulic performance (JF) and isotherm and streamlines contours. The results showed that the trapezoidal groove with groove tip length ratio of δ = 0.5, groove depth ratio β = 0.4, groove pitch ratio of ψ = 3.334, grooves orientation ratio of ζ = 0.00 and Re = 100 is the optimum Thermal Design for GMCHS with Nusselt number enhancement of 51.59% and friction factor improvement of 2.35%.
Mirghani Ishak Ahmed - One of the best experts on this subject based on the ideXlab platform.
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optimization of Thermal Design of heat sinks a review
International Journal of Heat and Mass Transfer, 2018Co-Authors: Hamdi E Ahmed, B H Salman, Sh A Kherbeet, Mirghani Ishak AhmedAbstract:Abstract Heat sinks are a kind of heat exchangers used for cooling the electronic devices due to the simplicity of fabrication, low cost, and reliability of heat dissipation. The extended surfaces from the heat sinks are either flat-plate fins or pins fins shapes. In the last decades, intensive attentions were spent on miniaturizing the electronic devices because of the high sophisticated micro- and nano-technology development. But the heat dissipation is still the major problem of enhancing the Thermal performance the heat sink. In this article, a comprehensive review is carried out on the methods used for optimizing the hydroThermal Design of heat sinks. Therefore, available investigations regarding the passive and active techniques utilized for enhancing the heat removal from heat sinks by modifying either the solid domain or fluid domain are covered. The purpose of this study is to summarize the investigational efforts spent for developing the Thermal performance of the heat sinks, limitations, and unsolved proposed solutions.
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optimum Thermal Design of triangular trapezoidal and rectangular grooved microchannel heat sinks
International Communications in Heat and Mass Transfer, 2015Co-Authors: Hamdi E Ahmed, Mirghani Ishak AhmedAbstract:Abstract A three-dimensional numerical simulation is conducted to investigate the effect of geometrical parameters on laminar water flow and forced convection heat transfer characteristics in grooved microchannel heat sink (GMCHS). Four geometry variables which are; the depth, tip length, pitch and orientation of the cavities are taken into account in order to optimize the aluminum heat sink Design. These geometric parameters could change the cavity shape from triangular to trapezoidal and then to rectangular shape. The governing and energy equations are solved using the finite volume method (FVM). The performance of GMCHS is evaluated in terms of Nusselt number ratio, Thermal/hydraulic performance (JF) and isotherm and streamlines contours. The results showed that the trapezoidal groove with groove tip length ratio of δ = 0.5, groove depth ratio β = 0.4, groove pitch ratio of ψ = 3.334, grooves orientation ratio of ζ = 0.00 and Re = 100 is the optimum Thermal Design for GMCHS with Nusselt number enhancement of 51.59% and friction factor improvement of 2.35%.
Zhe Wang - One of the best experts on this subject based on the ideXlab platform.
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layer pattern Thermal Design and optimization for multistream plate fin heat exchangers a review
Renewable & Sustainable Energy Reviews, 2016Co-Authors: Zhe Wang, Yanzhong LiAbstract:Cryogenic processes involve air separation and liquefaction. To reduce energy consumption in these processes, many compact and efficient equipments that can handle fluid heat transfer have been developed. Of these, a multistream plate-fin heat exchanger is one of the best solutions. Studies of plate-fin heat exchangers are currently focusing on four areas: heat transfer calculation, surface analysis, flow resistance and Design optimization. It is also important to optimize the layer patterns Design of multistream plate-fin heat exchangers. Several techniques have been proposed for this purpose thus far; however, most of these are based on qualitative or trial-and-error approaches. Therefore, no universally accepted methodology exists Designing for the layer pattern of multistream plate-fin heat exchangers. This article starts by reviewing traditional Design approaches for multistream plate-fin heat exchangers and then focuses on the development of layer pattern Design methods. It highlights three types of Thermal Design and evaluation criteria. It then discusses some suggestions and new methods for the optimization of the layer pattern Design that have emerged in recent years. Further, newly emerging intelligent heuristic algorithms for optimizing the layer pattern Thermal Design are discussed. In addition to these basic Design methodologies, the “layer pattern ring model” and “dual objective function” optimization methods developed by the author’s research team are discussed. Finally, the status of this research area is summarized, and emerging trends are noted.
Abubake M Elbashi - One of the best experts on this subject based on the ideXlab platform.
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optimum Thermal Design of humidification dehumidification desalination systems
Desalination, 2014Co-Authors: Mostafa H Sharqawy, Syed M Zubai, Mohammed A Anta, Abubake M ElbashiAbstract:Abstract Humidification dehumidification (HDH) process is used for producing fresh water from saline water at sub-boiling temperature. This process uses a low-temperature source such as solar energy or waste heat source. Although these heat sources are available with minimal operating cost, an optimum Thermal Design is required to maximize the water production rate for a given heat input. In this paper, the main Design and performance parameters are investigated for two HDH cycles namely, water-heated and air-heated cycles. First-law based Thermal analyses are provided and performance charts are presented by considering assumptions. The Design details of both the humidifier and dehumidifier are presented to determine their sizes under different Design conditions. It has been demonstrated that optimum mass flow rate ratios exist for each cycle such that the gained-output ratio (GOR) is maximized. In addition, it is demonstrated that higher GOR can be obtained by using large-size humidifiers and dehumidifiers due to increasing their effectiveness. Moreover, increasing the temperature of water entering the humidifier reduces GOR for the water-heated cycle whereas it increases for the air-heated cycle. A comparison is also carried out between the two cycles to provide guidelines for Designers in terms of, power requirements and components size.
