An experimental investigation has been performed to study the effect of flow pulsations on local, time-averaged convective heat transfer to an impinging water jet. Sinusoidal and square-pulse waveforms were considered. For the square waveform, the flow was completely halted for a portion of the pulsation cycle. Hot-film anemometry was used to characterize both the steady and the pulsating flows with regard to turbulence level and the spatial uniformity in the velocity profile across the nozzle width in order to assess separately the influence of flow pulsation on convective heat transfer. Pulse magnitude, which was defined as the ratio of the mean-to-peak velocity change to the mean flow velocity, was varied from 0.5 to 100 percent. Pulse frequencies ranged from 5 to 280 Hz, which corresponded to Strouhal numbers based on jet width and velocity of 0.014 to 0.964. Observed effects on convective heat transfer are explained in terms of nonlinear dynamic responses of the hydrodynamic and thermal boundary layers, boundary layer renewal, and bulges in the jet free surface.
Skip Nav Destination
Article navigation
Research Papers
Effect of Flow Pulsations on the Cooling Effectiveness of an Impinging Jet
H. S. Sheriff,
H. S. Sheriff
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
Search for other works by this author on:
D. A. Zumbrunnen
D. A. Zumbrunnen
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
Search for other works by this author on:
H. S. Sheriff
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
D. A. Zumbrunnen
Thermal Sciences Research Laboratory, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
J. Heat Transfer. Nov 1994, 116(4): 886-895 (10 pages)
Published Online: November 1, 1994
Article history
Received:
July 1, 1993
Revised:
January 1, 1994
Online:
May 23, 2008
Citation
Sheriff, H. S., and Zumbrunnen, D. A. (November 1, 1994). "Effect of Flow Pulsations on the Cooling Effectiveness of an Impinging Jet." ASME. J. Heat Transfer. November 1994; 116(4): 886–895. https://doi.org/10.1115/1.2911463
Download citation file:
Get Email Alerts
Cited By
Related Articles
Convective Heat Transfer Enhancement Due to Intermittency in an Impinging Jet
J. Heat Transfer (February,1993)
Time-Resolved Thermal Boundary-Layer Structure in a Pulsatile Reversing Channel Flow
J. Heat Transfer (August,2001)
Turbulence Dissipation in a Free-Surface Jet of Water and Its Effect on Local Impingement Heat Transfer From a Heated Surface: Part 2—Local Heat Transfer
J. Heat Transfer (February,1995)
Effect of Pulsed Film Cooling on Leading Edge Film Effectiveness
J. Turbomach (July,2012)
Related Proceedings Papers
Related Chapters
Extended Surfaces
Thermal Management of Microelectronic Equipment
Extended Surfaces
Thermal Management of Microelectronic Equipment, Second Edition
Introduction
Thermal Power Plant Cooling: Context and Engineering