Type of Document	Master's Thesis
Author	VandenBerghe, Terrance Michael
URN	etd-11142012-040143
Title	Heat transfer from in-line and perpendicular arrangements of cylinders in steady and pulsating crossflow
Degree	Master of Science
Department	Mechanical Engineering
Advisory Committee	Advisor Name Title Dillaha, Theo A. III Committee Chair Telionis, Demetri P. Committee Member Thomas, William C. Committee Member
Keywords	Heat-transfer media
Date of Defense	1985-09-15
Availability	restricted
Abstract An investigation was conducted to determine the effect of organized flow pulsations on mean heat transfer from a single cylinder, in-line arrangements and perpendicular arrangements of cylinders. Pulsation frequencies of up to twice the natural vortex shedding frequency and zero to peak. amplitudes as high as 36 percent were used. Pulsations were sinusoidal with at least 93 percent of the power at the fundamental frequency. Turbulence levels (Tu=0.5 percent) were not altered by the addition of unsteady flow. Reynolds number ranged from 23,000 Mean heat transfer was found to increase for all three arrangements when organized flow pulsations were applied. For a single cylinder and for perpendicular arrangements, heat transfer increases were found primarily on the back of the cylinder. For in-line arrangements, increases occurred mostly on the front of the cylinder. for the range of pitch ratio most useful to heat exchanger design, in-line arrangements were found to have a higher Nusselt number than perpendicular arrangements.
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