On the adverse influence of higher statistical moments of flow maldistribution on the performance of a heat exchanger

Chin, W.M. and Raghavan, V.R. (2011) On the adverse influence of higher statistical moments of flow maldistribution on the performance of a heat exchanger. International Journal of Thermal Sciences, 50 (4). pp. 581-591. ISSN 12900729

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Abstract

The work presented in this paper investigates the degradation effect of flow maldistribution on the thermal and hydraulic performance of a heat exchanger. A new mathematical model is derived based on Taylor series expansion to describe the contribution of each of the four statistical moments of distribution on the degradation problem. It is found that the first two moments, i.e. mean and standard deviation, have the highest effect on the performance degradation. Subsequent higher moments will give declining degradation effects until the fourth moment, kurtosis, which has no significant effect. Maldistribution with low standard deviation and high positive skew will give low thermal deteriorations, though a distribution with negative skew is preferred for low hydraulic performance losses. The design of the heat exchanger could be modified to give these favourable moments which would minimize the degradation effects of the maldistribution. Consequently, any effort to modify the flow distribution profile should be focused on optimizing the first three moments. © 2010 Elsevier Masson SAS. All rights reserved.

Item Type: Article
Additional Information: cited By 21
Uncontrolled Keywords: Degradation effect; Flow distribution; Flow maldistribution; Higher moments; Hydraulic performance; Maldistribution; New mathematical model; Performance degradation; Standard deviation; Statistical moments; Taylor series expansions, Heat exchangers; Hydraulics; Mathematical models; Statistics; Taylor series, Degradation
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 09 Nov 2023 15:50
Last Modified: 09 Nov 2023 15:50
URI: https://khub.utp.edu.my/scholars/id/eprint/2219

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