大学化学 >> 2021, Vol. 36 >> Issue (2): 2002037.doi: 10.3866/PKU.DXHX202002037

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开尔文公式计算蒸气冷凝与液体沸腾温度的误差及其分析

陶智彬, 张树永()   

  • 收稿日期:2020-02-20 录用日期:2020-03-30 发布日期:2020-04-13
  • 通讯作者: 张树永 E-mail:syzhang@sdu.edu.cn
  • 作者简介:张树永, Email: syzhang@sdu.edu.cn

Analysis of the Temperature Deviation for Boiling of Liquid and Condensation of Vapor Using Kelvin Equation

Zhibin Tao, Shuyong Zhang()   

  • Received:2020-02-20 Accepted:2020-03-30 Published:2020-04-13
  • Contact: Shuyong Zhang E-mail:syzhang@sdu.edu.cn

摘要:

讨论了利用开尔文公式计算液体沸腾与蒸气冷凝温度时的误差。指出这些误差是由于没有考虑温度变化对弯曲液面蒸气压和水平液面蒸气压之比等因素的影响,以及没有注意开尔文公式对小气泡的适用性导致的。指出了改善结果的方法,并进一步明确了开尔文公式的适用范围。

关键词: 开尔文公式, 弯曲液面, 蒸气压, 沸腾, 冷凝

Abstract:

The discrepancies for calculating condensation temperature and boiling temperature for droplet and small bubble using Kelvin equation were discussed. The discrepancies can be ascribed to the neglect of variation of the vapor pressure of curved surface to plain surface with temperature, and the misusing of Kelvin equation for small bubble during boiling. The way to reduce the discrepancy is introduced while the applicability of Kelvin equation is discussed.

Key words: Kelvin equation, Curved surface, Vapor pressure, Boiling, Condensing

MSC2000: 

  • G64