Superheated vapor heat transfer in narrow annular gap

During recent years, narrow channel heat transfer technique has been successfully used in many practical situations. It has notable advantages of small temperature difference and high heat transfer efficiency. Because it has been used in many areas, it has been studied by many researchers. However, the influence factor and mechanism of heat transfer have not been understood yet. In order to understand the heat transfer in the narrow annular tube, the experimental and theoretical study for superheated vapor heat transfer in narrow annular gap has been performed in the paper. The gap size is 0.95 mm, 1.55 mm and 2.02 mm respectively. The working fluid is distilled water. The model of heat transfer in annular gap is built to compare experiment data with computation results.(author)