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Study on the Flow and Heat Transfer of Slush Nitrogen in Horizontal Pipe

Author: ZhengHao
Tutor: JinTao
School: Zhejiang University
Course: Refrigeration and Cryogenic Engineering
Keywords: Nitrogen slurry Pressure drop Melting characteristics Nitrogen slurry preparation
CLC: TB64
Type: Master's thesis
Year: 2010
Downloads: 31
Quote: 0
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Abstract


Slurry as a solid and liquid coexisting substances (i.e., containing small solid particles in the liquid and the diameter can be controlled at about several tens of microns ), and still has a good fluidity in the case of a suitable proportion of the solid component . Currently more concerned about the low temperature slurry is the hydrogen slurry ( temperature 13.8K) and nitrogen slurry ( temperature 63.2K ) . Compared with the subcooled liquid nitrogen , nitrogen pulp having a high density , low temperature, a large heat capacity and other properties, and is considered to be the ideal coolant of high - temperature superconducting device . Nitrogen slurry flow and heat transfer properties of nitrogen slurry application is essential . Nitrogen slurry research began in the past decade , much less than hydrogen pulp . Because the latter has a strong appeal for space propulsion technology . Nitrogen pulp experiment -based work is slightly less than the theoretical and numerical calculation . Nitrogen slurry flow pressure loss factors and nitrogenase granule on the pressure loss, the role of the heat transfer characteristics and so unclear. Based on this background , this article focuses carried out the work of the following aspects : 1 . Slurry flow numerical calculation model analysis . Since the two-phase flow complexity , numerical calculation to simulate the turbulence model and the selection of multiphase flow model is essential . This article describes several common models and analyzed their advantages and disadvantages , applicability and accuracy of the simulation to provide a reference for subsequent slurry flow . 2 . Nitrogen slurry pipeline flow characteristics using CFD software for numerical simulation analysis . Analyzed nitrogen slurry flow pressure loss in a horizontal circular tube , draw a number of factors that affect the pressure loss , and the impact of relationship . Laboratory preparation of nitrogen slurry . Nitrogen slurry preparation laboratory bench is built according to the actual situation , the successful preparation of the ice slurry and nitrogen slurry . Nitrogen slurry preparation process , the cooling of the liquid nitrogen bath , compare the difference in the slurry state of the cooling curve of the nitrogen slurry and final nitrogen under different pumping speed . 4 the nitrogenase particles heat to melt the numerical simulation analysis . Analyzed analyzed nitrogenase particles melt to obtain a particle diameter variation of the two - dimensional results Figure nitrogen slurry pipeline heat transfer characteristics .

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration materials
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