Heat transfer similarities between impinging jets and axial-flow impellers

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• 作者：Karel Petera ; Martin Dostál ; Tomáš Jirout…
• 关键词：heat transfer ; impinging jet ; axial flow impeller
• 刊名：Theoretical Foundations of Chemical Engineering
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：50
• 期：6
• 页码：937-944
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Industrial Chemistry/Chemical Engineering;
• 出版者：Pleiades Publishing
• ISSN：1608-3431
• 卷排序：50

文摘

Similarities in the flow and heat transfer characteristics between simulation results of a round impinging jet and experimental data obtained on an agitated vessel with an axial flow impeller are presented in this paper. The electrodiffusion method was used in measuring the local heat transfer coefficients on a flat bottom of an agitated vessel. A small axial impeller has been built to provide a clearly defined flow imitating a submerged confined jet impinging the vessel bottom. Our simulation and experimental results show that the flow pattern in the impinging jet region below the axial flow impeller can be compared to the stagnation region of a round impinging jet with a corresponding tangential velocity component. CFD simulations of an impinging jet showed also the importance of different boundary conditions on small electrodes used with the electrodiffusion method and give an approximation of necessary correction factor.