Study on heat transportation of an impinging jet interfering with a Couette flow (comparison with Poiseuille flow)

IF 0.7 Q4 MECHANICS

Journal of Fluid Science and Technology Pub Date : 2019-01-01 DOI:10.1299/JFST.2019JFST0006

Jumpei Kitayama, T. Kubo

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引用次数: 1

Abstract

Paper No.19-00079 © 2019 The Japan Society of Mechanical Engineers [DOI: 10.1299/jfst.2019jfst0006] Abstract In this study, we compare the flow and temperature fields of a heated impinging jet interfering with a Couette flow and a Poiseuille flow through numerical simulations. We find that the instantaneous vortex structure in the Couette main flow has some periodicity and affects the heat transfer on the jet impinging surface. In time-averaged flow and temperature fields, the Nusselt number shows unique distributions. Further, a counter-rotating vortex pair is extracted, similar to the previously reported studies on a jet in a cross flow. It is found that this vortex pair involves the main flow fluid and causes a unique Nusselt number distribution. The overall heat transfer in the Couette main flow is lower than that in the Poiseuille main flow. From the mean velocity field, a back current occurs behind the jet inlet, which is similar to the separation in the wake flow of a cylinder crossing the main flow. In addition, the fluctuation velocity in the Couette main flow does not spread wider than that in the Poiseuille main flow, and high velocity fluctuations concentrate on the front edge of the jet flow. The distributions of both mean and fluctuation velocities of the Couette flow interfering with the jet are similar to those of the turbulent Couette flow.

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撞击射流干涉库埃特流的热输运研究(与泊泽维尔流的比较)

论文No.19-00079©2019 The Japan Society of Mechanical Engineers [DOI: 10.1299/jfst.]摘要本研究通过数值模拟比较了加热碰撞射流干涉Couette流和Poiseuille流的流动场和温度场。研究发现，Couette主流中的瞬时涡结构具有一定的周期性，影响着射流撞击表面的换热。在时间平均流场和温度场中，努塞尔数表现出独特的分布。此外，提取了一个反向旋转的涡对，类似于先前报道的对交叉流中的射流的研究。研究发现，该涡对涉及主流流体，并产生独特的努塞尔数分布。库埃特主流的总换热量低于泊泽维尔主流。从平均速度场看，射流入口后出现了回流，类似于圆柱穿过主流时尾流中的分离。此外，库埃特主流的波动速度分布范围并不比泊泽维尔主流大，高速波动集中在射流的前缘。干涉射流的库埃特流的平均速度和波动速度的分布与湍流库埃特流的分布相似。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Fluid Science and Technology MECHANICS-

CiteScore

1.00

自引率

12.50%

发文量

期刊介绍： Journal of Fluid Science and Technology (JFST) is an international journal published by the Fluids Engineering Division in the Japan Society of Mechanical Engineers (JSME). JSME had been publishing Bulletin of the JSME (1958-1986) and JSME International Journal (1987-2006) by the continuous volume numbers. Considering the recent circumstances of the academic journals in the field of mechanical engineering, JSME reorganized the journal editorial system. Namely, JSME discontinued former International Journals and projected new publications from the divisions belonging to JSME. The Fluids Engineering Division acted quickly among all divisions and launched the premiere issue of JFST in January 2006. JFST aims at contributing to the development of fluid engineering by publishing superior papers of the scientific and technological studies in this field. The editorial committee will make all efforts for promoting strictly fair and speedy review for submitted articles. All JFST papers will be available for free at the website of J-STAGE (http://www.i-product.biz/jsme/eng/), which is hosted by Japan Science and Technology Agency (JST). Thus papers can be accessed worldwide by lead scientists and engineers. In addition, authors can express their results variedly by high-quality color drawings and pictures. JFST invites the submission of original papers on wide variety of fields related to fluid mechanics and fluid engineering. The topics to be treated should be corresponding to the following keywords of the Fluids Engineering Division of the JSME. Basic keywords include: turbulent flow; multiphase flow; non-Newtonian fluids; functional fluids; quantum and molecular dynamics; wave; acoustics; vibration; free surface flows; cavitation; fluid machinery; computational fluid dynamics (CFD); experimental fluid dynamics (EFD); Bio-fluid.