Managing water on heat transfer surfaces: A critical review of techniques to modify surface wettability for applications with condensation or evaporation

被引:107
作者
Edalatpour, M. [1 ,2 ]
Liu, L. [3 ]
Jacobi, A. M. [4 ]
Eid, K. F. [2 ]
Sommer, A. D. [1 ]
机构
[1] Miami Univ, Dept Mech & Mfg Engn, Oxford, OH 45056 USA
[2] Miami Univ, Dept Phys, Appl Nano & Microphys Lab, Oxford, OH 45056 USA
[3] Lawrence Technol Univ, A Leon Linton Dept Mech Engn, Southfield, MI 48075 USA
[4] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA
关键词
Surface wettability; Gradient surfaces; Hydrophilic; Hydrophobic; Energy systems; HVAC&R applications; CONTACT-ANGLE HYSTERESIS; ENHANCING DROPWISE CONDENSATION; SELF-ASSEMBLED MONOLAYER; SUPERHYDROPHOBIC SURFACES; DROPLET MOTION; LIQUID-DROPS; HARVESTING PERFORMANCE; TENSION GRADIENTS; WETTING PHENOMENA; ALUMINUM SURFACE;
D O I
10.1016/j.apenergy.2018.03.178
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Most materials of practical interest are neither completely wetting nor completely non-wetting. "Surface wettability" then refers to the degree that a surface is hydrophilic (i.e. water-loving) or hydrophobic (i.e. water fearing). Through careful design, it is possible to alter the natural wettability of a surface to be more water loving or water-fearing. This is principally achieved by modifying the surface chemistry and/or surface roughness. In some cases, modifying the surface may bring operational benefit or advantage. For example, aluminum and copper (which are used in the construction of heat exchangers) tend to retain water in application, which can degrade performance. Modifying the surface however to be superhydrophilic can help to spread out the condensate, reduce the air-side pressure drop, and facilitate drainage. Moreover, by creating a wettability pattern or gradient, it is possible to predetermine the initiating sites for condensation on a surface as well as facilitate droplet motion and/or control the water droplet movement path. In the first part of this review, the current state of the art of surface wettability modification and control techniques are presented, which includes topographical manipulation, chemical modification, as well as methods for creating gradient surfaces and patterned wettability. In the second part of this review, possible applications and the potential impact of these methodologies in energy systems are discussed with a special focus on heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems and components.
引用
收藏
页码:967 / 992
页数:26
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