Appropriate position of porous insert in a heat exchanger by thermohydraulic analysis

被引：10

作者：

Akar, S. ^{[1
]}

Rashidi, S. ^{[1
]}

Esfahani, J. Abolfazli ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad,91775-1111, Iran

来源：

Heat Transfer - Asian Research | 2017年 / 46卷 / 08期

关键词：

Heat exchangers - Reynolds number - Drops - Flow of fluids - Heat transfer - Pressure drop;

D O I：

10.1002/htj.21279

中图分类号：

学科分类号：

摘要：

This paper presents numerically an appropriate position of a porous insert to get a better thermohydraulic performance from a porous heat exchanger. The simulation is based on the Darcy-Brinkman-Forchheimer model in the porous field. Two-dimensional continuity, momentum, and energy equations with incompressible, laminar, steady assumptions have been solved using a finite volume approach. The analysis is performed for different values of porous layer thickness, length, and porosity at a fixed value of Reynolds number (Re = 100) and thermal conductivity ratio (Rc = 5). The results showed that there is about a 48% and 13% reduction in pressure drop and Nusselt number, respectively, by decreasing horizontal porous substrate thickness from 1 to 1/2 for δv = 1/3 at Ε = 0.7. As a result, the pressure drop reduces considerably with a reasonable reduction in heat transfer rate by decreasing horizontal porous substrate thickness from 1 to 1/2. © 2017 Wiley Periodicals, Inc.

引用

页码：1363 / 1379