Heat transfer and flow friction correlations for perforated plate matrix heat exchangers

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Ratna Raju, L.^1 ; Sunil Kumar, S.^2 ; Chowdhury, K.^1 ; Nandi, T.K.^1

CryogenicEngineering Centre, IIT Kharagpur, India^1

College of Engineering Trivandrum, India^2

关键词: Cryogenic applications;    Flow frictions;    Generalized correlation;    Heat transfer and flows;    Heat transfer and pressure drop;    High conductivity;    Low conductivity;    Thermo-hydraulic;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012085/pdf
DOI  :  10.1088/1757-899X/171/1/012085

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Perforated plate matrix heat exchangers (MHE) are constructed of high conductivity perforated plates stacked alternately with low conductivity spacers. They are being increasingly used in many cryogenic applications including Claude cycle or Reversed Brayton cycle cryo-refrigerators and liquefiers. Design of high NTU (number of (heat) transfer unit) cryogenic MHEs requires accurate heat transfer coefficient and flow friction factor. Thermo-hydraulic behaviour of perforated plates strongly depends on the geometrical parameters. Existing correlations, however, are mostly expressed as functions of Reynolds number only. This causes, for a given configuration, significant variations in coefficients from one correlation to the other. In this paper we present heat transfer and flow friction correlations as functions of all geometrical and other controlling variables. A FluentTMbased numerical model has been developed for heat transfer and pressure drop studies over a stack of alternately arranged perforated plates and spacers. The model is validated with the data from literature. Generalized correlations are obtained through regression analysis over a large number of computed data.