CIESC Journal ›› 2013, Vol. 64 ›› Issue (4): 1236-1241.DOI: 10.3969/j.issn.0438-1157.2013.04.016

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Heat transfer characteristics of water film flash evaporation in vacuum ice making

JI Jun, ZHANG Xuelai, LIU Xiaowei, WU Yunyun, HAN Zhong, YANG Yang   

  1. (College of Merchant Marine, Shanghai Maritime University, Shanghai 201306, China
  • Received:2012-07-16 Revised:2012-10-22 Online:2013-04-05 Published:2013-04-05
  • Supported by:

    supported by the National Natural Science Foundation of China(50976064), the Key Project of Shanghai Municipal Education Commission(12ZZ154) and the Key Discipline of Shanghai Municipal Education Commission(J50603).

水膜闪蒸真空制冰的换热特性

纪珺, 章学来, 刘小微, 吴云云, 韩中, 杨阳   

  1. 上海海事大学商船学院,上海 201306
  • 通讯作者: 章学来
  • 作者简介:纪珺(1982—),女,博士,讲师。
  • 基金资助:

    国家自然科学基金项目(50976064);上海市教委重点项目(12ZZ154);上海市教委重点学科项目(J50603)。

Abstract: A water film flash evaporation vacuum ice-making system is developed.The experiment was carried out to investigate the influence of flash evaporation pressure, thickness and initial temperature of water film on the flash evaporation process.The thickness of the water film was 15, 35, 55 and 75 mm.Initial temperature of water film ranged from 2℃ to 10℃, and flash evaporation pressure varied from 100 Pa to 600 Pa.The characteristics of the flash evaporation process were recorded using a CCD camera of the visualization system.The experimental results show that under the operating conditions, lower flash evaporation pressure leads to faster change of water film temperature at constant initial temperature of water film.Higher initial temperature of water film makes the water film temperature varies more quickly at constant pressure.As water film thickness increases, the decrease rate of water film temperature reduces.Based on the experimental results, a correlation for water film temperature with flash evaporation pressure, thickness and initial temperature of water film is presented with the maximum error of 24.19%.

Key words: water film, flash evaporation, film thickness, initial temperature, flash evaporation pressure

关键词: 水膜, 闪蒸, 水膜厚度, 初始温度, 闪蒸压力

CLC Number: