Author:
Huang Kuan-Tzu,Liu Yao-Hsien
Abstract
Substantial heat transfer enhancement can be achieved by cooling with air/water mist flow because of droplet impingement and liquid film/fragment evaporation on the heated surface, which leads to a high heat-removal rate. An experimental investigation was conducted in a square channel with continuous and broken V-shaped ribs. To generate a mist flow, micro droplets were introduced into the gas stream. The rib angle of attack was 45°, and the rib spacing-to-height ratios were 10 and 20. The air Reynolds number ranged from 7900 to 24,000, and the water-to-air volume flow ratio was less than 0.1%. The net heat inputs ranged from 1.1–3.1 W/cm2 and 3.4–9.4 W/cm2 for the air and mist flow cases, respectively. Because the deposited liquid fragments produced uneven temperature distribution on the heated surface, steady-state infrared thermography was used to visualize the heat transfer distribution. Two to seven times higher heat transfer was attained for the broken ribs when using the mist flow than when using air flow. This increase was mainly attributed to the broken structure, which facilitated liquid transport and enhanced liquid coverage. In addition, the broken ribs produced a smaller friction factor than continuous ribs. The broken structures were beneficial for higher thermal performance in the mist flow.
Funder
Ministry of Science and Technology, Taiwan
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous)
Reference22 articles.
1. Heat transfer to binary mist flow
2. A study of mist-cooling (1st report: Investigation of mist cooling;Toda;Heat Transf. Jpn. Res.,1972
3. An approximate calculation of heat transfer during flow of an air-water mist along a heated flat plate
4. Heat transfer from tube banks to air/mist flow;Nakayama;Int. J. Heat Mass Transf.,1988
5. Study on mist cooling for heat exchanger;Hayashi;JSME Int. J.,1990
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