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of 1.24, 1.45 and 2.23cm were used to investigate the effect of diameter ratio on heat transfer coefficient. The temperature of the heated tube were measured by eight copper constantan thermo-couples immersed along the heated length. The experiment was carried out at an atmospheric pressure and in low quality range and the mass flow rate was varied from 45.8 to 208 grams per second. The flow pattern in a horizontal annulus is more compli cated than in a horizontal tube, therefore visual studies were made of the flow pattern of the fluid boiling in horizontal annulus.

Heat Transfer to Boiling Nitrogen Flowing in Horizontal Annulus