Type of Document Dissertation Author Al-aqal, Osama M.A Author's Email Address osama_alaqal@hotmail.com URN etd-07242003-233812 Title Heat TRANSFER DISTRIBUTIONS ON THE WALLS OF A NARROW CHANNEL WITH JET IMPINGEMENT AND CROSS FLOW Degree Doctor of Philosophy Program Mechanical Engineering School School of Engineering Advisory Committee
Advisor Name Title M. K. Chyu Committee Chair J. L. Chen Committee Member L. Schaefer Committee Member P. Givi Committee Member Keywords
- LIQUID CRYSTAL INLINE JETS
Date of Defense 2003-07-17 Availability unrestricted Abstract Impingement with high velocity gas jets has become an established method of convectively cooling or heating services in a wide variety of processes and thermal control applications. Examples include cooling of gas turbine airfoils and electronic equipment, drying of paper and textiles or other thin layers or films, annealing of metals, and glass tempering operation.
This study investigates the effect of the size of jet, number of jets and jet-to-target plate spacing for jet-issuing plate and target plate in the presence of cross flow originated from the upstream jets on the heat transfer distribution of the jet and target plates. Two-dimensional inline arrays of circular jets of air impinging on a heat transfer surface paralleled to the jet-issuing plate are considered. The air, after impingement, is constrained to exit in a single direction along a channel formed by the target plate and the jet-issuing plate. The downstream jets are subjected to a cross flow from the upstream jets.Three sets of jet distribution were tested, 6 rows with one hole in each row, 12 rows with 2 holes in each row and 18 rows with 3 holes in each row. The jet-to-jet spacing for all jet plates is 4 holes diameter in the spanwise direction and 6.5 holes diameter in the streamwise direction. Tests were conducted at Reynolds number between 5,000 and 33,000. The heat transfer measurement uses a liquid crystal imaging technique with a one dimensional transient conduction model.
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