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Title: Effect of topology on hybrid-linked jet impingement

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 108; Journal Issue: PA; Related Information: CHORUS Timestamp: 2017-12-07 12:26:04; Journal ID: ISSN 0017-9310
Country of Publication:
United Kingdom

Citation Formats

Yang, Li, Parbat, Sarwesh Narayan, Min, Zheng, and Chyu, Minking K. Effect of topology on hybrid-linked jet impingement. United Kingdom: N. p., 2017. Web. doi:10.1016/j.ijheatmasstransfer.2016.12.072.
Yang, Li, Parbat, Sarwesh Narayan, Min, Zheng, & Chyu, Minking K. Effect of topology on hybrid-linked jet impingement. United Kingdom. doi:10.1016/j.ijheatmasstransfer.2016.12.072.
Yang, Li, Parbat, Sarwesh Narayan, Min, Zheng, and Chyu, Minking K. Mon . "Effect of topology on hybrid-linked jet impingement". United Kingdom. doi:10.1016/j.ijheatmasstransfer.2016.12.072.
title = {Effect of topology on hybrid-linked jet impingement},
author = {Yang, Li and Parbat, Sarwesh Narayan and Min, Zheng and Chyu, Minking K.},
abstractNote = {},
doi = {10.1016/j.ijheatmasstransfer.2016.12.072},
journal = {International Journal of Heat and Mass Transfer},
number = PA,
volume = 108,
place = {United Kingdom},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.ijheatmasstransfer.2016.12.072

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  • The effect of channel rotation on jet impingement cooling by arrays of circular jets in two channels was studied. Jet flow direction was in the direction of rotation in one channel and opposite to the rotation direction in the other channel. The jets impinged normally on two smooth target walls. Heat transfer results are presented for these two target walls, for the jet walls containing the jet producing orifices, and for side walls connecting the target and jet walls. The flow exited the channels in a single direction, radially outward, creating a crossflow on jets at larger radii. The meanmore » test model radius-to-jet diameter ratio was 397. The jet rotation number was varied from 0.0 to 0.0028 and the isolated effects of jet Reynolds number (5000 and 10,000), and wall-to-coolant temperature difference ratio (0.0855 and 0.129) were measured. The results for nonrotating conditions show that the Nusselt numbers for the target and jet walls in both channels are about the same and are greater than those for the side walls of both channels. However, as rotation number increases, the heat transfer coefficients for all walls in both channels decrease up to 20% below those results that correspond to nonrotating conditions. As the wall-to-coolant temperature difference ratio increases, heat transfer coefficient decreases up to 10% with other parameters held constant.« less
  • Experiments are performed to study surface curvature effects on the impingement cooling low and the heat transfer processes over a concave and a convex surface. A single air jet issuing from different size slots continuously impinges normally on the concave side or the convex side of a heated semicylindrical surface. An electrical resistance wire is used to generate smoke, which allows the authors to visualize the impinging flow structure. The local heat transfer Nusselt number along the surfaces is measured. For impingement on a convex surface, three-dimensional counterrotating vortices on the stagnation point are initiated, which result in the enhancementmore » of the heat transfer process. For impingement on a concave surface, the heat transfer Nusselt number increases with increasing surface curvature, which suggests the initiation of Taylor-Goertler vortices along the surface. In the experiment, the Reynolds number ranges from 6,000 to 350,000, the slot-to-plate spacing from 2 to 16, and the diameter-to-slot-width ratio D/b from 8 to 45.7. Correlations of both the stagnation point and the average Nusselt number over the curved surface, which account for the surface curvature effect, are presented.« less
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  • A theoretical and experimental investigation of a water jet impinging on a melting solid surface has been carried out. Ice, octane, p-xylene, and olive oil served as the meltable solid materials, comprising a Prandtl number range of 5 to 2800. An available laminar stagnation flow model was utilized to describe melting heat transfer in the jet impingement region. Melting rate measurements were found to agree quite well with the values predicted with this model.