Heat transfer evaluation on ice-roughened cylinders

A total of eight rotor ice-accretion experiments were conducted to obtain representative natural ice surface roughness on cylinders. The test matrix contained two time series of ice roughness, which were based on 30, 60, 90, and 120 s ice accretion. A high-resolution, nonintrusive, transient heat transfer measurement technique was used to evaluate the heat transfer on the casting models. The proposed method has been validated against experimental heat transfer measurements on clean cylinders. Three Reynolds numbers in the transition regime were tested, namely, Re = 1, 2, and 3 × 10⁵. The calculated heat transfer coefficient was then nondimensionalized and presented in terms of Frossling number andCSRfor comparison. The heat transfer curve in CSR was found to be able to eliminate the shifted magnitude due to difference in testing Reynolds number.