Abstract
Abstract Longitudinal heat conduction is known to be an important factor in the design of a printed circuit heat exchanger(PCHE) for cryogenic applications. Parasitic heat conduction through the heat exchanger frame needs to be considered because it isknown to decrease the effectiveness of the heat exchanger. In this paper, a conjugate heat transfer problem in a simple counter-flow PCHE is analyzed by a computational fluid dynamics simulation. The effect of longitudinal conduction in a straight channel is compared with the theoretical effectiveness-NTU relationship that assumes a “thin” heat exchanger frame. The calculation results suggest that the theoretical model is valid in the present calculation conditions where NTU is < 13. Key words Longitudinal heat conduction(유동방향 전도열전달), Printed circuit heat exchanger(인쇄기판형 열교환기), Cryogenic heat exchanger(극저온 열교환기)†Corresponding author, E-mail: shyoon@kimm.re.kr 기호설명 A s : 열교환기 프레임 단면적 c p : 비열값 D h : 유로 수력직경 f : 마찰계수(Darcy friction factor)
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