Study on condensation characteristics of vapor with non-condensable gas in corrugated tubes

doi:10.11949/0438-1157.20190492

Abstract

Abstract:

This paper presents a numerical investigation on the condensation characteristics of vapor with non-condensable gas in corrugated tubes. Several 2D examples with different corrugated structures, air contents and Reynolds numbers are studied and compared. Results show that along with the increase of air content, the wall average heat transfer coefficient decreases in the corrugated tube. The oscillation of fluid flow and heat transfer is generated due to the corrugated structure. With the increasing of wave height, the skin friction coefficient increased, and the wall average heat transfer coefficient first increased, and then decreased, the maximum of wall average heat transfer coefficient in this paper is in 0.032 m. The influence of wave height on the flow and heat transfer characteristics is more obvious than the width of the wave node and the space between two waves. The effect of inlet fluid flow-rate on the skin friction coefficient is also evaluated and discussed to provide some guidelines for future engineering applications.

Key words: numerical simulation, corrugated tubes, non-condensable gas, condensation inside tubes, gas-liquid flow, mixtures

摘要：

通过数值模拟，研究了波节结构、空气含量及Reynolds数Re对含空气的水蒸气波节管内凝结特性的影响，并与圆形换热管内的情况进行了对比。模拟结果表明：空气含量增加，波节管壁面平均传热系数减小；波节管内流体流动和换热过程均呈现振荡波动；波节高度增加，壁面平均传热系数先增加后降低，在波节高度0.032 m达到峰值，而摩擦系数一直增加；波节间距减小，波节宽度增加，壁面平均传热系数及摩擦系数均增大；波节高度对波节管内流动和换热影响均大于波节宽度和波节间距。

关键词: 数值模拟, 波节管, 不凝气体, 管内冷凝, 气液两相流, 混合物

CLC Number:

TK 124

Wenhua JIA, Maocheng TIAN, Guanmin ZHANG, Min WEI. Study on condensation characteristics of vapor with non-condensable gas in corrugated tubes[J]. CIESC Journal, 2019, 70(S2): 201-207.

贾文华, 田茂诚, 张冠敏, 魏民. 含不凝气体蒸汽波节管内凝结特性研究[J]. 化工学报, 2019, 70(S2): 201-207.

Figures/Tables 10

Fig.1 Physical model

Table 1 Model size

管号	换热管内径/m	波节高度/m	换热管长度/m	波节间距s₁/m	波节宽度s₂/m
1#	0.025	0	0.275	—	—
2#	0.025	0.003	0.275	0.005	0.015
3#	0.025	0.05	0.275	0.005	0.015
4#	0.025	0.007	0.275	0.005	0.015
5#	0.025	0.009	0.275	0.005	0.015
6#	0.025	0.009	0.257	0.003	0.015
7#	0.025	0.009	0.293	0.007	0.015
8#	0.025	0.009	0.255	0.005	0.013
9#	0.025	0.009	0.295	0.005	0.017

Fig.2 Model for comparison

Fig.3 Centerline temperature inside heat exchange tube

Fig.4 Change of average heat transfer coefficient with different air content in different tube structures

Fig.5 Change of average heat transfer coefficient with different tube structures in different Re

Fig.6 Cloud diagram of fluid velocity distribution in heat exchange tubes with different structures

Fig.7 Change of average heat transfer coefficient with different pitch and width of node in different Re

Fig.8 Change of fluid velocity at local position of 5#,7# and 9# heat exchange tubes

Fig.9 Change of wall friction coefficient with Re under different nodal structures

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