The thermal-hydraulic characteristics of staggered circular finned-tube heat exchangers under dry and dehumidifying conditions

Jiin Yuh Jang; Jen Tien Lai; Long Chi Liu

doi:10.1016/S0017-9310(98)00037-4

The thermal-hydraulic characteristics of staggered circular finned-tube heat exchangers under dry and dehumidifying conditions

Jiin Yuh Jang, Jen Tien Lai, Long Chi Liu

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

Fluid flow and heat transfer over four row circular tinned-tube heat exchangers with staggered arrangement are studied experimentally and numerically. Two types of finned-tube configurations have been investigated under the dry and wet conditions for different values of inlet frontal velocity ranging from 1 to 6 m s^-1. The experimental results indicated that the sensible Colburn factor, J_s, and for the friction factor, f, the wet coils are, respectively 20% and 15% higher than that for the dry coils. The three-dimensional numerical results of laminar model for the dry coils are also presented. Conjugate convective heat transfer in the flow field and heat conduction in the circular fins are considered also. The numerical results for the streamline, isotherm, Nusselt number and fin efficiency are shown and compared with the experiments.

Original language	English
Pages (from-to)	3321-3337
Number of pages	17
Journal	International Journal of Heat and Mass Transfer
Volume	41
Issue number	21
DOIs	https://doi.org/10.1016/S0017-9310(98)00037-4
Publication status	Published - 1998 Nov

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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title = "The thermal-hydraulic characteristics of staggered circular finned-tube heat exchangers under dry and dehumidifying conditions",

abstract = "Fluid flow and heat transfer over four row circular tinned-tube heat exchangers with staggered arrangement are studied experimentally and numerically. Two types of finned-tube configurations have been investigated under the dry and wet conditions for different values of inlet frontal velocity ranging from 1 to 6 m s-1. The experimental results indicated that the sensible Colburn factor, Js, and for the friction factor, f, the wet coils are, respectively 20% and 15% higher than that for the dry coils. The three-dimensional numerical results of laminar model for the dry coils are also presented. Conjugate convective heat transfer in the flow field and heat conduction in the circular fins are considered also. The numerical results for the streamline, isotherm, Nusselt number and fin efficiency are shown and compared with the experiments.",

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AU - Jang, Jiin Yuh

AU - Lai, Jen Tien

AU - Liu, Long Chi

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