干旱区生态环境知识资源中心(Arid): Influence of jumping-droplet condensation on the properties of separated flow in an air-cooled condenser tube: An Euler-Lagrange approach

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DOI	10.1177/09576509221138623
	Influence of jumping-droplet condensation on the properties of separated flow in an air-cooled condenser tube: An Euler-Lagrange approach
	Chakraborty, Soumik; Kar, Uttam Kumar; Sengupta, Sayantan; Pramanik, Shantanu
通讯作者	Sengupta, S
来源期刊	PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
ISSN	0957-6509
EISSN	2041-2967
出版年	2023
卷号	237 期号:4 页码:747-764
英文摘要	An Air-cooled condenser (ACC), which finds popularity in a steam power plant in arid areas, is usually less efficient as film condensation occurs inside the condenser tube. Recent research is directed towards eliminating the thermally insulating liquid film with the application of novel superhydrophobic surfaces. The self-cleaning property of such surfaces facilitates easy condensate drainage in the form of jumping droplets exposing favourable nucleation sites, thereby significantly promoting dropwise condensation. The present study explores the characteristics of jumping droplet condensation in finite condenser tubes using computational fluid dynamics (CFD). The wall-heat-flux for condensation is modelled here by a uniform suction boundary condition. The strength of suction is quantified by a suction Reynolds number Re- s . We mainly focus on the zone corresponding to 2.3 < Re- s < 10, where no previous solution exists. In a long horizontal tube, the progressive realization of a self-similar region starting from the developing regions is demonstrated. We examine the characteristics of the developing region based on the sign of the pressure gradient. The results of three-dimensional CFD simulations illustrate the variations of droplet trajectories with the inception size and coordinates of jumping droplets determined locally by the relative contributions of various force components, viz. gravity, axial drag in the vapour core, suction induced radial drag and Saffman lift. The present study also predicts the effect of pipeline inclination on condensate drainage. Ultimately, considering multiple jumps, we found that the maximum condensate emission can be obtained for small droplets (5-15 mu m), while medium-sized droplets (20-50 mu m) are most advantageous for isolated jumps.
英文关键词	Air-cooled condenser coalescence droplet trajectory jumping-droplet superhydrophobic
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000890501800001
WOS关键词	SUPERHYDROPHOBIC SURFACES ; DROPWISE CONDENSATION ; HEAT-TRANSFER ; LAMINAR-FLOW ; GROWTH ; COALESCENCE ; DEPOSITION ; PARTICLES ; TRANSPORT ; TURBULENT
WOS类目	Thermodynamics ; Engineering, Mechanical
WOS研究方向	Thermodynamics ; Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398163
推荐引用方式 GB/T 7714	Chakraborty, Soumik,Kar, Uttam Kumar,Sengupta, Sayantan,et al. Influence of jumping-droplet condensation on the properties of separated flow in an air-cooled condenser tube: An Euler-Lagrange approach[J],2023,237(4):747-764.
APA	Chakraborty, Soumik,Kar, Uttam Kumar,Sengupta, Sayantan,&Pramanik, Shantanu.(2023).Influence of jumping-droplet condensation on the properties of separated flow in an air-cooled condenser tube: An Euler-Lagrange approach.PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY,237(4),747-764.
MLA	Chakraborty, Soumik,et al."Influence of jumping-droplet condensation on the properties of separated flow in an air-cooled condenser tube: An Euler-Lagrange approach".PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 237.4(2023):747-764.