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contributor authorXie, Yonghui
contributor authorLi, Ping
contributor authorLan, Jibing
contributor authorZhang, Di
date accessioned2017-05-09T00:59:44Z
date available2017-05-09T00:59:44Z
date issued2013
identifier issn0022-1481
identifier otherht_135_5_052201.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/152114
description abstractBased on combined particle image velocimetry (PIV) and numerical simulation, the flow and heat transfer characteristics of a single jet impinging on a dimpled surface for Dj/D = 0.318, 0.5, 1.045; خ´/D = 0.1, 0.2, 0.3; Rej = 5000, 10,000, 23,000, were investigated for the first time. The distance between jet nozzle and plate was fixed and equal to H/D = 2. The results show that the flow structures of the single jet impingement with dimpled target surface can be summarized into three typical conceptual flow structures. Particularly, the third flow structure in the form of a large toroidal vortex bound up with the dimple is the result of the centrifugal force of the flow deflection at the stagnation region and spherical centrifugal force of the deep dimple surface. The heat transfer area increases when the dimple relative depth increases. For the cases of Dj/D = 0.318 and 0.5, the area increasing dominate the heat transfer process, and the average Nusselt number increases with the increasing of dimple relative depth. For the cases with Dj/D = 1.045, the local Nusselt number reduction dominate the heat transfer process, the average Nusselt number decreases with the increasing of dimple relative depth. The average Nusselt number of the Dj/D = 0.318 and 0.5 cases is larger than the baseline case, while those of the Dj/D = 1.045 cases are smaller than the baseline case. Furthermore, the correlative expressions of the local Nusselt number, stagnation points Nusselt number and average Nusselt number are obtained.
publisherThe American Society of Mechanical Engineers (ASME)
titleFlow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface
typeJournal Paper
journal volume135
journal issue5
journal titleJournal of Heat Transfer
identifier doi10.1115/1.4023360
journal fristpage52201
journal lastpage52201
identifier eissn1528-8943
treeJournal of Heat Transfer:;2013:;volume( 135 ):;issue: 005
contenttypeFulltext


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