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4th Thermal and Fluids Engineering Conference

ISSN: 2379-1748

INLET FLOW MALDISTRIBUTION EFFECT ON THREE-FLUID CROSS-FLOW HEAT EXCHANGER ARRANGEMENTS

Jyothiprakash KH
PES University, 100 feet ring road, Bengaluru 560085, Karnataka, India

Y T Krishnegowda
Maharaja Institute of Technology, Mysuru, Karnataka, India

K. N. Seetharamu
PES University, 100 feet ring road, Bengaluru 560085, Karnataka, India

DOI: 10.1615/TFEC2019.che.028439
pages 221-230


KEY WORDS: Three-Fluid, Cross-Flow Heat Exchangers, flow maldistribution

Abstract

Investigations on the effect of uniform inlet flow and inlet flow maldistribution in two types of three-fluid cross-flow heat exchanger arrangement is carried out. Type of heat exchangers being selected are the cross-cocurrent flow arrangement (C4), and the cross-countercurrent flow arrangement (C3). The central hot fluid is assumed to exchange heat with two cross-flow cold fluids in both the arrangements. The governing equations are derived based on the conservation of energy principle and solved by finite element method. The results are presented in terms of overall effectiveness and number of transfer units for different values of governing parameters. Deterioration factor is used to compare the effects on two types of arrangements. The results indicate that when there is flow maldistribution effect, the thermal performance of a three-fluid heat exchanger will be degraded more than the performance of the uniform inlet flow effect in all cases. Also cross-cocurrent (C4) flow arrangement is superior to the cross-countercurrent (C3) flow arrangement in both the uniform or maldistribution inlet flow effects.

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