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A numerical study on heat transfer enhancement and design of a heat exchanger with porous media in continuous hydrothermal flow synthesis system

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Chinese Journal of Chemical Engineering 2017年第10期25卷 1352-1359页

作者： Pedram Karimi Pour-Fard Ebrahim Afshari Masoud Ziaei-Rad shahed taghian-dehaghani Department of Mechanical Engineering Faculty of Engneering University of Isfahan Hezar Jerib Ave. Isfahan 81746-73441 Iran

The aim of this study is to use a new configuration of porous media in a heat exchanger in continuous hydrothermal flow synthesis(CHFS)system to enhance the heat transfer and minimize the required length of the heat *** this purpose,numerous numerical simulations are performed to investigate performance of the system with porous ***,the numerical simulation for the heat exchanger in CHFS system is validated by experimental ***,porous media is added to the system and six different thicknesses for the porous media are examined to obtain the optimum thickness,based on the minimum required length of the heat ***,by changing the flow rate and inlet temperature of the product as well as the cooling water flow rate,the minimum required length of the heat exchanger with porous media for various inlet conditions is *** investigations indicate that using porous media with the proper thickness in the heat exchanger increases the cooling rate of the product by almost 40% and reduces the required length of the heat exchanger by approximately 35%.The results also illustrate that the most proper thickness of the porous media is approximately equal to 90% of the product tube's *** of this study lead to design a porous heat exchanger in CHFS system for various inlet conditions.

关键词： Continuous hydrothermal flow synthesis Heat exchanger Heat transfer enhancement Porous media Numerical simulation

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