Thermal and flow characteristics of a single-row circular-finned tube heat exchanger under elevated free-stream turbulence

J. A. Moore; J. P.J. Stevenson; R. Grimes

doi:10.1016/j.ijheatfluidflow.2015.11.001

Thermal and flow characteristics of a single-row circular-finned tube heat exchanger under elevated free-stream turbulence

J. A. Moore
, J. P.J. Stevenson
, R. Grimes

University of Limerick

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

Abstract

The thermal performance of single-row heat exchangers is generally considered to be inferior to multi-row heat exchangers. It is therefore desirable to optimize the former; especially for those cases which cannot accommodate an alternative. In this study, the heat transfer performance of a single-row circular-finned tube heat exchanger was investigated experimentally under elevated disturbance levels. Specifically, grid-generated turbulence (GGT)-the characteristics of which had been measured beforehand with a hot-wire anemometer-was applied to a clean-flow benchmark case and measurements taken at the heat exchanger outlet. It was shown that when the grid is positioned appropriately, a mean enhancement (in global Nusselt number) of up to 11% can be achieved. Flow visualizations revealed the flow structures responsible for the increase in heat transfer.

Original language	English
Pages (from-to)	48-57
Number of pages	10
Journal	International Journal of Heat and Fluid Flow
Volume	57
DOIs	https://doi.org/10.1016/j.ijheatfluidflow.2015.11.001
Publication status	Published - 1 Feb 2016

Keywords

Grid-generated turbulence
Heat exchanger flow visualization
Single-row circular finned tubes

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10.1016/j.ijheatfluidflow.2015.11.001

Cite this

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title = "Thermal and flow characteristics of a single-row circular-finned tube heat exchanger under elevated free-stream turbulence",

abstract = "The thermal performance of single-row heat exchangers is generally considered to be inferior to multi-row heat exchangers. It is therefore desirable to optimize the former; especially for those cases which cannot accommodate an alternative. In this study, the heat transfer performance of a single-row circular-finned tube heat exchanger was investigated experimentally under elevated disturbance levels. Specifically, grid-generated turbulence (GGT)-the characteristics of which had been measured beforehand with a hot-wire anemometer-was applied to a clean-flow benchmark case and measurements taken at the heat exchanger outlet. It was shown that when the grid is positioned appropriately, a mean enhancement (in global Nusselt number) of up to 11\% can be achieved. Flow visualizations revealed the flow structures responsible for the increase in heat transfer.",

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AU - Stevenson, J. P.J.

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AB - The thermal performance of single-row heat exchangers is generally considered to be inferior to multi-row heat exchangers. It is therefore desirable to optimize the former; especially for those cases which cannot accommodate an alternative. In this study, the heat transfer performance of a single-row circular-finned tube heat exchanger was investigated experimentally under elevated disturbance levels. Specifically, grid-generated turbulence (GGT)-the characteristics of which had been measured beforehand with a hot-wire anemometer-was applied to a clean-flow benchmark case and measurements taken at the heat exchanger outlet. It was shown that when the grid is positioned appropriately, a mean enhancement (in global Nusselt number) of up to 11% can be achieved. Flow visualizations revealed the flow structures responsible for the increase in heat transfer.

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KW - Single-row circular finned tubes

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JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

ER -

Thermal and flow characteristics of a single-row circular-finned tube heat exchanger under elevated free-stream turbulence

Abstract

Keywords

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