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

doi:10.3866/PKU.DXHX202002037

Abstract

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

Zhibin Tao, Shuyong Zhang. Analysis of the Temperature Deviation for Boiling of Liquid and Condensation of Vapor Using Kelvin Equation[J].University Chemistry, 2021, 36(2): 2002037.

Figures/Tables 3

References 17

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步数	T/℃	p_r/p^*	p^**/kPa	T’/℃
1	30.00	2.779	1.0698	7.956
2	7.956	3.155	0.9423	6.107
3	6.107	3.192	0.9314	5.939
4	5.939	3.195	0.9305	5.925
5	5.925	3.196	0.9302	5.920
6	5.920	3.196	0.9302	5.920

T/℃	p^*/kPa	σ/(mN?m^?1)	ρ/(kg?m^?3)
30.00	4.2470	71.19	995.61
7.956	1.0698	74.52	999.81
6.107	0.9423	74.78	999.90
5.939	0.9314	74.81	999.91
5.925	0.9305	74.81	999.91
5.920	0.9302	74.81	999.91

步数	T/℃	p_r/p^*	p^**/kPa	T’/℃
1	100.00	0.999	101.431	100.0034
2	100.0034	0.999	101.431	100.0034

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

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