NDLI: Axial Heat Conduction in Parallel Flow Microchannel Heat Exchangers

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mathew, B. Hegab, H.
Copyright Year	2009
Abstract	This paper deals with the effect of axial heat conduction on the hot and cold fluid effectiveness of a balanced parallel flow microchannel heat exchanger. The ends of wall separating the fluids are subjected to Dirichlet boundary condition. This leads to heat transfer between the microscale heat exchanger and its surroundings and thereby leading to axial heat conduction through the wall separating the fluids. Three one dimensional energy equations were formulated, one for each of the fluids and one for the wall. These equations were solved using finite difference method. The effectiveness of the fluids depends on the NTU, axial heat conduction parameter, and the temperature of the ends of the wall separating the fluids. With decrease in temperature of the end wall at the inlet section of the fluids, while keeping the temperature of the other end wall constant, the effectiveness of the hot and cold fluid increased and decreased, respectively. When the temperature at the ends of the wall separating the heat exchanger is average of the inlet temperature of the fluids then there is no axial heat conduction through the heat exchanger. The effectiveness of a counter flow microchannel heat exchanger is better than that of a parallel flow microchannel heat exchanger subjected to similar operating conditions, i.e. axial heat conduction parameter and end wall temperatures.
Starting Page	1149
Ending Page	1158
Page Count	10
File Format	PDF
ISBN	9780791843826
DOI	10.1115/IMECE2009-11775
e-ISBN	9780791838631
Volume Number	Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
Conference Proceedings	ASME 2009 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2009-11-13
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Heat conduction Wall temperature Fluids Temperature Microscale devices Boundary-value problems Heat exchangers Flow (dynamics) Heat transfer Microchannels Finite difference methods
Content Type	Text
Resource Type	Article

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