This study dealt with transient heat transfer from heated hori-zontal cylinders to a hydrocarbon polymer of high viscosity.nIt had been predicted analytically that during transient free convection the thermal boundary layer would grow in sine during the conduction phase of the flour and then shrink to some steady state value as fluid motion began. It had also been predicted that the film heat transfer coefficient would reach a minium and then increase to some steady state value. A series of seven tests on one-fourth inch diameter cylinders and six tests on wires of thirty-two hundreths inches in diameter showed experimentally that the predictions occured.
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