Experimental study on refrigerant distribution and evaporation characteristics of different diameter micro channels in airfoil-shaped tube

Abstract Present study investigates the roughness effect on laminar gas flow for microchannels ranging from 40 to 600 μm with various roughness heights (40–82 nm) by systematical experiments. The micro-channels are manufactured by micro-machining technology and KOH anisotropic etching is employed to achieve various roughness patterns. Experimental results shows that higher product levels of Reynolds number (Reh) and friction factor (f) are obtained for microchannels of larger size and smaller relative roughness and friction factor f approaches to laminar flow theory value f0 for very smooth channel but the ratio of (f/f0) decreases as the surface roughness increases.

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Experimental Study of Micro-Flowing Characteristics of Liquid Transport in Round Micro-Channels

Materials Science Forum - Advances in Materials Manufacturing Science and Technology II ◽

10.4028/0-87849-421-9.29 ◽

2006 ◽

pp. 29-32

Author(s):

Zhi Yong Ling ◽

Ji Chang Yang ◽

Jian Ning Ding ◽

Yong Liu ◽

Zhi Wen Zhuang ◽

...

Keyword(s):

Experimental Study ◽

Liquid Transport ◽

Micro Channels

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Effect of lubricating oil on condensation characteristics of R600a inside a horizontal U-shaped tube: Experimental study

International Journal of Thermal Sciences ◽

10.1016/j.ijthermalsci.2019.106007 ◽

2019 ◽

Vol 145 ◽

pp. 106007 ◽

Cited By ~ 5

Author(s):

M.M. Ahmadpour ◽

M.A. Akhavan-Behabadi ◽

B. Sajadi ◽

A. Salehi-Kohestani

Keyword(s):

Experimental Study ◽

Lubricating Oil ◽

Shaped Tube

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An Experimental Study of the Abrasive Water Jet Micro-Machining Process for Quartz Crystals

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.565.339 ◽

2012 ◽

Vol 565 ◽

pp. 339-344 ◽

Cited By ~ 3

Author(s):

H. Qi ◽

J.M. Fan ◽

Jun Wang

Keyword(s):

Experimental Study ◽

Removal Rate ◽

Water Jet ◽

Machining Process ◽

Bottom Surface ◽

Micro Machining ◽

Abrasive Water Jet ◽

Process Variables ◽

Jet Impact ◽

Micro Channels

An experimental study of the machining process for micro-channels on a brittle quartz crystal material by an abrasive slurry jet (ASJ) is presented. A statistical experiment design considering the major process variables is conducted, and the machined surface morphology and channelling performance are analysed to understand the micro-machining process. It is found that a good channel top edge appearance and bottom surface quality without wavy patterns can be achieved by employing relatively small particles at shallow jet impact angles. The major channel performance measures, i.e. material removal rate (MRR) and channel depth, are then discussed with respect to the process parameters. It shows that with a proper control of the process variables, the abrasive water jet (AWJ) technology can be used for the micro-machining of brittle materials with high quality and productivity.

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