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首页> 外文期刊>Heat Transfer Research >LAMINAR PULSATING CONFINED JET FLOW OF NANOFLUIDS IN A DUCT WITH ISOFLUX WALL
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LAMINAR PULSATING CONFINED JET FLOW OF NANOFLUIDS IN A DUCT WITH ISOFLUX WALL

机译：Laminar脉动纳米流体中纳米流体的限制射流，用异氟氟壁壁

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摘要

Pulsating flows have a potential for research in many aspects. A pulsating unsteady confined jet is still unclear and requires further investigation because of many upcoming applications. In the past decade, nanofluids have attracted much interest because of their reported superior thermal performance and many potential applications. Also, a pulsating confined jet in a nanofluid is a new idea in fluid mechanics and heat transfer. In this paper, two-dimensional pulsating confined jet flow of nanofluids through a duct with isoflux walls is investigated numerically. In order to solve the Navier-Stokes and energy equations, the finite volume approach with collocated grid is employed. The momentum interpolation technique of Rhie and Chow is applied in SIMPLE algorithm. The simulation is performed at different pulse parameters (amplitude, Strouhal and Reynolds numbers) and volume fractions of nanoparticles for unsteady flow and also various values of the duct-to-jet width ratio (aspect ratio). Increasing both the frequency and amplitude leads to a slight increase in the Nusselt number but by increasing the Reynolds number, aspect ratio, and volume fraction the average Nusselt number will increase more. By increasing the Reynolds number and volume fraction, a higher rate of heat transfer is observed. The authors have not found in the open literature any records similar to the present work. One of the advantages of using pulsation in a nanofluid is a delay in the sedimentation process of nanoparticles.
机译：脉动流动在许多方面具有研究。由于许多即将到来的应用，脉动不稳定的限制喷射仍然不清楚并需要进一步调查。在过去十年中，纳米流体因其报告了卓越的热性能和许多潜在应用而引起了很多兴趣。而且，纳米流体中的脉动限制射流是流体力学和传热中的新思想。在本文中，在数值上研究了纳米流体通过管道纳米流体的二维脉动限制射流。为了解决Navier-Stokes和能量方程，采用带有并置网格的有限体积方法。简单算法应用了Rhie和Chow的动量插值技术。在不同脉冲参数（幅度，斯特鲁尔和雷诺数）和用于非稳定流量的纳米颗粒的体积分数中进行模拟，以及管 - 喷射宽度比（纵横比）的各种值。增加频率和幅度导致何时遇到的次数略有增加，而是通过增加雷诺数，纵横比和体积分数，平均露天数将增加更多。通过增加雷诺数和体积分数，观察到更高的传热速率。作者尚未在公开文学中找到任何类似于目前工作的记录。在纳米流体中使用脉动的一个优点是纳米颗粒的沉降过程中的延迟。

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