Experimental Study of the Effect of a Cross Airflow on the Dynamics and Heat Transfer Performance of Impinging Circular Water Jets on a Concave Surface

被引：4

作者：

Agyeman, Emmanuel Kwadwo Kale ^{[1
,2
]}

Edelin, Denis ^{[3
]}

Lecointe, Damien ^{[2
]}

机构：

[1] Univ Nantes, Serv Rech, GEPEA Lab, IUT Nantes, Carquefou, France

[2] IRT Jules Verne, Res Inst, Bouguenais, France

[3] Univ Nantes, LTEN Lab, Polytech Nantes, Nantes, France

来源：

HEAT TRANSFER ENGINEERING | 2022年 / 43卷 / 06期

关键词：

Annular space - Concave surface - Flow parameters - Hot water jet - Jet diameter - Jet orifices - Separation distances - Single jet impingement;

D O I：

10.1080/01457632.2021.1887640

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this study, the impingement of a concave surface by hot water jets is investigated. The jets are subjected to a cross airflow at ambient temperature in order to study the effects of the interactions between both fluids on the jet dynamics and the heat flux at jet stagnation area. Different parameters such as the jet diameter, separation distance between two adjacent jets, Reynolds numbers of the jets and the Reynolds number of the airflow are varied. These studies reveal that imposing airflow in the annular space between the jet orifice and the impacted surface can increase the surface wetted area by 40% and can also enhance the heat transfer coefficient at the jet stagnation area by as much 105%. It was also observed that reducing the jet to air mass flow ratio to values below 0.75 leads to the tilting of the water jets and the widest uniformly heated area among the flow parameters tested can be obtained with a ratio of the distance between the jet orifice and the impacted surface and the jet orifice diameter of 4.5 for a single jet impingement.

引用

页码：516 / 530

页数：15

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