Transient heat transfer characteristics of small jet impingement on high-temperature flat plate

•Transient heat transfer characteristics of small-jet impingement is studied.•Heat transfer near stagnation and boundary point is opposite with the decrease of H/D.•Position of vortex moves from boundary to stagnation point with the decrease of H/D. Numerical studies on the transient heat transfer c...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2017-11, Vol.114, p.981-991
Main Authors: Yu, Pingping, Zhu, Keqian, Shi, Qiang, Yuan, Ningyi, Ding, Jianning
Format: Article
Language:English
Subjects:
Aerodynamics
Fluid flow
Glass tempering
Heat transfer
Impingement
Jet impingement
Numerical analysis
Reynolds number
Small jet impingement
Stagnation point
Studies
Temperature
Transient heat transfer
Velocity
Velocity field
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Summary:•Transient heat transfer characteristics of small-jet impingement is studied.•Heat transfer near stagnation and boundary point is opposite with the decrease of H/D.•Position of vortex moves from boundary to stagnation point with the decrease of H/D. Numerical studies on the transient heat transfer characteristics of small-air-jet impingement under the condition of a large temperature difference between the nozzle and the plate are presented. The Reynolds number (Re) varied from 20,000 to 60,000 which is based on the hydraulic diameter of the circular jet. The nondimensional jet-to-plate distance (H/D) with nozzle diameter (D) of 5mm is varied from 0.2 to 2. Variations in the stagnation point and boundary point Nusselt numbers with cooling times are discussed. It was found that with the decrease of jet-to-plate distance the heat transfer near stagnation point is enhanced, while it is decreased near boundary point. The velocity field is proposed as an explanation for the observed transient heat transfer.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2017.06.112