Purpose

The purpose of this study is to perform computational analysis on the steady flow and heat transfer due to a slot nanojet impingement onto a heated moving body. The object is moving at constant speed and nanoparticle is included in the heat transfer fluid. The unsteady flow effects and interactions of multiple impinging jets are also considered.

Design/methodology/approach

The finite volume method was used as the solver in the numerical simulation. The movement of the hot body in the channel is also considered. Influence of various pertinent parameters such as Reynolds number, jet to target surface spacing and solid nanoparticle volume fraction on the convective heat transfer characteristics are numerically studied in the transient regime.

Findings

It is found that the flow field and heat transfer becomes very complicated due to the interaction of multiple impinging jets with the movement of the hot body in the channel. Higher heat transfer rates are achieved with higher values of Reynolds number while the inclusion of nanoparticles resulted in a small impact on flow friction. The middle jet was found to play an important role in the heat transfer behavior while jet and moving body temperatures become equal after t = 80.

Originality/value

Even though some studies exist for the application of jet impingement heat transfer for a moving plate, the configuration with a solid moving hot body on a moving belt under the impacts of unsteady flow effects and interactions of multiple impinging jets have never been considered. The results of the present study will be helpful in the design and optimization of various systems related to convective drying of products, metal processing industry, thermal management in electronic cooling and many other systems.

中文翻译：

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狭缝纳米射流撞击运动热体的对流传热计算分析

目的

本研究的目的是对由于狭缝纳米射流撞击加热的移动体而产生的稳态流动和热传递进行计算分析。物体以恒定速度移动，纳米颗粒包含在传热流体中。还考虑了多个撞击射流的不稳定流动效应和相互作用。

设计/方法/方法

在数值模拟中采用有限体积法作为求解器。热体在通道中的运动也被考虑在内。在瞬态状态下，数值研究了各种相关参数，如雷诺数、射流与目标表面间距和固体纳米颗粒体积分数对对流传热特性的影响。

发现

研究发现，由于多次撞击射流与通道中热体运动的相互作用，流场和传热变得非常复杂。更高的雷诺数值可实现更高的传热率，而纳米颗粒的加入对流动摩擦的影响很小。发现中间射流在传热行为中起重要作用，而射流和移动体的温度在t = 80后变得相等。

原创性/价值

尽管有一些研究将射流冲击传热应用于移动板，但从未考虑过在不稳定流动效应和多个冲击射流相互作用的影响下，在移动带上具有固体移动热体的配置。本研究的结果将有助于与产品对流干燥、金属加工业、电子冷却中的热管理和许多其他系统相关的各种系统的设计和优化。