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research-article

Thermal-hydraulic Performance Analysis of a Novel Convergent Double Pipe heat Exchanger

[+] Author and Article Information
Ahmed Al-Sammarraie

ASME Member, Department of Mechanical Engineering, University of California, Riverside, Riverside, CA 92521
aalsammarraie@engr.ucr.edu

Kambiz Vafai

ASME Fellow, Department of Mechanical Engineering, University of California, Riverside, Riverside, CA 92521
vafai@engr.ucr.edu

1Corresponding author.

ASME doi:10.1115/1.4042487 History: Received June 04, 2018; Revised December 21, 2018

Abstract

The present investigation proposes an innovative convergent double pipe heat exchanger (C-DPHE). A two-dimensional axisymmetric heat transfer model with counterflow is employed to analyze the thermal and hydraulic performance of this configuration numerically. The impact of convergence in the flow direction, using a wide range of contraction ratio (Cr), is explored. The effect of Reynolds and Prandtl numbers on the flow and heat transfer is addressed as well. The model results were validated with available data from the literature, and an excellent agreement has been confirmed. In general, the findings of the present study indicate that increasing the contraction ratio increases heat transfer and pressure drop in the C-DPHE. Moreover, this configuration has a prominent and sustainable performance, compared to a conventional double pipe heat exchanger, with an enhancement in heat transfer rate up to 32% and performance factor (PF) higher than one. Another appealing merit for the C-DPHE is that it is quite effective and functional at low Reynolds and high Prandtl numbers, respectively, since no high-operating pumping power is required. Further, the optimal operating conditions can be established utilizing the comprehensive information provided in this work.

Copyright (c) 2019 by ASME
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