Abstract
The specific aim of this work is to clarify the characteristics of an ice/water mixture flowing in a horizontal circular pipe which will be used potentially in a district cooling system (DCS) utilizing the latent heat of ice. Sample ice was made by a chip-ice making machine, and the experimental result was compared with that of a natural snow/water mixture. The flow pattern was observed, and the pressure drop was measured in polyvinylchrolide pipes with diameters of 40, 80 and 150 mm, as well as in an 80 mm-diameter steel pipe and an 80 mm shot-blasted steel pipe. It has been shown that the empirical formula for the excess pressure loss coefficient of a snow/water mixture proposed by the present authors holds also for that of an ice/water mixture, and also applies to large-diameter pipes which will be used in DCS. The pipe material and surface roughness have shown to affect the pressure drop through friction between ice clusters and pipe wall, and a constant in the formula is related to the friction coefficient. Based on this relationship, a method to predict the pressure drop of an ice/water mixture flow in an arbitrary pipe is proposed.
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