Study on heat transfer characteristics of high temperature heat pipe with large length diameter ratio

DOI:	10.11809/bqzbgcxb2023.10.038
Keywords:	large length diameter ratio; high temperature heat pipe; inclination; heat transfer characteristic
Abstract:	As a kind of high temperature heat pipe with special geometrical parameters, the high temperature heat pipe with large length diameter ratio has broad application prospect in nuclear energy, solar energy development and other fields. Due to the special structure proportion, its operation characteristics are obviously different from those of conventional high temperature heat pipes. Therefore, for two different fillings rates high temperature sodium heat pipe with large length diameter ratio (outer diameter D=16 mm, axial length L=2 400 mm, length diameter ratio L/D up to 150) developed in this study, the heat transfer performance of heat pipe under different working conditions is investigated. The results show that the comprehensive performance of high temperature heat pipe with 15% liquid filling rate is better than that with 25% filling rate. Under high heat load conditions, the former is prone to heat transfer deterioration at low inclination angles (15°, 30°), while the latter is prone to heat transfer deterioration at high inclination angles (60°, 75°, 90°). Under normal operating conditions, the heat transfer performance of heat pipe decreases with the increase of inclination angle, and the influence of inclination angle on the heat transfer performance of the 15% filling rate heat pipe is lower than that of the 25% filling rate heat pipe. The increase of input power is helpful to improve the overall heat transfer performance of the heat pipe, which proves that the high temperature heat pipe with large length diameter ratio has better thermal shock performance under certain conditions.
Issue:	Vol. 44 No. 10 (2023)
Published:	2023-10-28
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