The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 32-154
Full Name: Rozli Zulkifli
Position: Senior Lecturer
Age: ON
Sex: Male
Address: Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia
Country: MALAYSIA
Tel: 89216522
Tel prefix: +603
Fax: +603-89259659
E-mail address: rozli@eng.ukm.my
Other E-mails: enrozli@gmail.com
Title of the Paper: Comparison of Local Nusselt Number Between Steady and Pulsating Jet at Different Jet Reynolds Number
Authors as they appear in the Paper: Rozli Zulkifli, Kamaruzzaman Sopian, Shahrir Abdullah and Mohd Sobri Takriff
Email addresses of all the authors: ksopian@eng.ukm.my, shahrir@eng.ukm.my, sobri@eng.ukm.my
Number of paper pages: 10
Abstract: Abstract: - The study was carried out to determine the effect of pulsating frequencies exiting from a hot circular air jet on the local heat transfer of a flat impingement aluminium plate. The velocity profile of a steady heated circular air jet and pulsating air jet at frequencies of 10 and 20 Hz was measured in the first part of the study. The same set-up was used to measure the heat flux of the pulsating jet impinging on a flat aluminium plate. The heat flux of the heated air jet impinging on the plate was measured using a heat flux micro-sensor at radial positions between 0 to 12 cm away from the stagnation point. Measurement of the heat flux was used to calculate the local heat transfer coefficient and local Nusselt Number for steady air jet and for air jet pulsating frequencies of 10 and 20 Hz. The Reynolds number used were 16 000, 23 300 and 32 000. Results obtained show that the local Nusselt number calculated at all measurement point for pulsating jet were!
higher than the local Nusselt number for steady jet. The results for pulsating jet Nusselt number was higher than the steady jet Nusselt number for the value of frequencies measured are due to the higher localised heat transfer. The higher Nusselt number obtained at localized radial positions can be due to the higher instantaneous velocity as was shown from the velocity profile plotted in the first part of the experiment. The relationship between the two results shows that higher flow velocity and turbulence intensity gives higher localized heat transfer.
Keywords: Pulsating air jet, jet frequency, Nusselt number, Reynolds number, Heat transfer coefficient
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