Single phase flow characteristics of FC-72 and ethanol in high aspect ratio rectangular mini- and micro-channels. (28th September 2016)

• Record Type: Journal Article
• Authors: Wang, Yuan; Wang, Zhen-guo
• Is Part Of: Journal of micromechanics and microengineering. Volume 26:Number 11(2016:Nov.)
• Publication Date: 2016-09-28
• Subjects: friction factor -- single phase -- high aspect ratio -- mini- and micro-channel; Microelectromechanical systems -- Periodicals; Micromechanics -- Periodicals; 621.38105
• DOI: 10.1088/0960-1317/26/11/115003
• Languages: English
• ISSNs: 0960-1317

Abstract

Abstract: Single phase flow friction factor of FC-72 and ethanol in mini-and micro-channels are experimentally investigated in the present study. High aspect ratio3 rectangular channels are selected, the hydraulic diameters of which are 571 µ m, 762 µ m and 1454 µ m, and the aspect ratios are 20, 20 and 10 respectively. Degassed ethanol and FC-72 are used as working fluids. All the friction factors acquired in the 571 µ m and 762 µ m channels agree with the conventional friction theory within ±20%–±25%. In the 1454 µ m channel, however, deviations from the conventional theory occur and a modified empirical correlation of friction factor as a function of Reynolds number is proposed. Early transition from laminar to transitional flow is captured. Besides, effects of liquid physical properties are discussed. Lower viscosity and higher liquid density are responsible for the higher friction factor of FC-72. The influence of liquid properties weakens as the Reynolds number increases.