Experimental investigation on thermal characteristics of hot surface by synthetic jet impingement

•Thermohydrulic behaviour of hot surface with synthetic jet impingment is studied.•The infrared thermal imaging technique is used to measure temperature data.•Nusselt number increases with the decrease in plate thickness.•Rectangular orifice exhibits better thermal performance compared to square and...

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Bibliographic Details
Published in:Applied thermal engineering 2020-01, Vol.165, p.114596, Article 114596
Main Authors: Singh, Pushpanjay K., Sahu, Santosh K., Upadhyay, Prabhat K., Jain, Akash K.
Format: Article
Language:English
Subjects:
Actuators
Austenitic stainless steels
Diameters
Electronics cooling
Excitation frequency
Fluid flow
Foils
Free convection
Heat conductivity
Heat exchangers
Heat transfer
Heat transfer coefficients
Hot surfaces
Impingement heat transfer
Jet impingement
Orifice meters
Orifice shape
Orifices
Reynolds number
Synthetic jet
Synthetic jets
Temperature
Thermal imaging
Thermodynamic properties
Thickness
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Summary:•Thermohydrulic behaviour of hot surface with synthetic jet impingment is studied.•The infrared thermal imaging technique is used to measure temperature data.•Nusselt number increases with the decrease in plate thickness.•Rectangular orifice exhibits better thermal performance compared to square and circular orifices.•A correlation is proposed for Nusselt number. This paper analyses the thermal behavior of impinging synthetic jet by employing various orifice shapes such as circular, square, and rectangular for a given hydraulic diameter. The effect of thickness of orifice plate on heat transfer behaviour is studied in this investigation. An electromagnetic actuator is used as an oscillating diaphragm for the generation of synthetic jet. A stainless steel (SS) foil (AISI-304) with 0.05 mm thickness is used as the test specimen. It is heated by DC power source (APLAB, L-3260). The surface temperature of the test specimen is measured by using a thermal imaging technique during synthetic jet impingement. Tests are carried out for wide range of Reynolds number (Re = 1183–5448), different values of jet-to-plate distance (z/d = 0–30), various orifice plate thicknesses (t = 1.6–5 mm), for a given hydraulic diameter of the orifice. The peak value of the heat transfer coefficient is found to be 16.1 times more than the heat transfer coefficient for natural convection. A correlation is proposed for Nusselt number.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2019.114596