Heat transfer and pressure drop of air/water mist flow in horizontal Minichannels

2018 ◽  
Vol 55 (5) ◽  
pp. 1347-1358 ◽  
Author(s):  
Ping-Tse Ho ◽  
Yao-Hsien Liu
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Water Mist ◽  
Mist Flow

scholarly journals Time Averaged and Fluctuating Heat Transfer Measurements in an Atomising Mist Jet Nozzle

2009 ◽  
Author(s):  
Oisn F. P. Lyons ◽  
Darina B. Murray ◽  
Gerard Byrne ◽  
Tim Persoons
Keyword(s):  
Heat Transfer ◽  
Internal Structure ◽  
Research Group ◽  
Single Phase ◽  
Water Mist ◽  
Phase Behaviour ◽  
Heat Transfer Characteristics ◽  
Air Jets ◽  
Mist Flow ◽  
Jet Nozzle

Much is already known about the heat transfer characteristics of impinging air jets, and they are widely used in many engineering applications. There currently exist many correlations describing such characteristics. However, the complex internal structure of many nozzles can lead these to produce results which deviate from those predicted by correlations. One such nozzle is currently used in this research group to produce a water mist flow and this paper describes the experimental characteristics of its single phase behaviour.

scholarly journals Studies on MHD pressure drop and heat transfer of helium-lithium annular-mist flow in a transverse magnetic field.

1987 ◽  
Vol 30 (269) ◽  
pp. 1768-1775 ◽  
Author(s):  
Akira INOUE ◽  
Masanori ARITOMI ◽  
Minoru TAKAHASHI ◽  
Yosihito NARITA ◽  
Toshikazu YANO ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Pressure Drop ◽  
Transverse Magnetic Field ◽  
Transverse Magnetic ◽  
Mist Flow

Performance of a Compact Cooling Unit Utilizing Air-Water Mist Flow

1983 ◽  
Vol 105 (1) ◽  
pp. 18-24 ◽  
Author(s):  
T. Aihara ◽  
R. Saga
Keyword(s):  
Heat Transfer ◽  
Parallel Plate ◽  
Heat Transfer Performance ◽  
Thermal Conditions ◽  
Water Mist ◽  
Transfer Performance ◽  
Cooling Unit ◽  
Wide Range ◽  
Mist Flow ◽  
Plate Channel

Performance of a new compact cooling unit for semiconductors, being composed of an atomizer, a fan, and a heat-dissipating surface with no fin, has been measured over a wide range of the mass flow rate of spray water, m˙, and the wall heat flux. The heat transfer performance of the present compact, unit with m˙ = 0 to 1.05 g/s, attains 1.8 to 20 times that of the parallel-plate channel under the same thermal conditions.

Nonboiling Heat Transfer and Friction of Air/Water Mist Flow in a Square Duct With Orthogonal Ribs

2017 ◽  
Vol 9 (4) ◽  
Author(s):  
Yi-Hsuan Huang ◽  
Chiao-Hsin Chen ◽  
Yao-Hsien Liu
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Heat Transfer Enhancement ◽  
Film Formation ◽  
Heated Surface ◽  
Air Flow ◽  
Water Mist ◽  
Air Cooling ◽  
Transfer Enhancement ◽  
Mist Flow

Heat transfer of air/water mist flow in a single-side heated vertical duct was experimentally investigated. The mist flow was produced by introducing fine dispersed water droplets into the air stream, and the water–air mass flow ratios were up to 15%. The Reynolds numbers of the air flow were 7900, 16,000, and 24,000. The rib spacing-to-height ratios were 10 and 20 in the current study. Mist flow cooling achieved higher heat transfer rates mainly because of the droplet deposition and liquid film formation on the heated surface. The heat transfer enhancement on the smooth surface by the mist flow was 4–6 times as high as the air flow. On the ribbed surface, a smaller rib spacing of 10 was preferred for air cooling, since the heat transfer enhancement by the flow reattachment was better utilized. However, the rib-induced secondary flow blew away the liquid films on the surface, and the heat transfer enhancement was degraded near the reattachment region for the mist cooling. A larger rib spacing-to-height ratio of 20 thus achieved higher heat transfer because of the liquid film formation beyond the reattachment region. The heat transfer enhancement on the ribbed surface using mist flow was 2.5–3.5 times as high as the air flow. The friction factor of the mist flow was two times as high as the air flow in the ribbed duct.

Non-Boiling Heat Transfer of Air/Water Mist Flow in a Square Duct With Orthogonal Ribs

2016 ◽  
Author(s):  
Yi-Hsuan Huang ◽  
Chiao-Hsin Chen ◽  
Yao-Hsien Liu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heated Surface ◽  
Air Flow ◽  
Liquid Films ◽  
Water Mist ◽  
Transfer Enhancement ◽  
Square Duct ◽  
Flow Mixing ◽  
Mist Flow

Heat transfer of mist flow in a rib-roughened square duct was experimentally determined using infrared thermography. The mist flow was generated by introducing fine dispersed water droplets into the air stream. A constant heat flux was applied to the surface during the test and the surface temperature was kept below the boiling point. The heat transfer measurement was performed on a heated surface located inside a vertical square duct with a hydraulic diameter of 4cm. The air/water mist flow was carried upward by air flow from a blower placed at the bottom of the duct. The flow passed through a flow straightener and entered the heated region of the square duct. The Reynolds numbers of the carrier fluid were 7900, 16000 and 24000. The results showed that mist flow cooling achieved higher heat transfer rates compared to the air cooling. Thin liquid films formed on the heated surface by the mist flow and the evaporation from the droplets and liquid film contributed to a higher heat removal rate. The heat transfer enhancement on the smooth surface by the mist flow was 4 to 6 times higher compared to the air flow. Rib turbulators were typically applied in channel walls for heat transfer enhancement in gas turbine blades or heat exchangers. Ribs caused flow reattachment and promoted flow mixing. The higher Nusselt number induced by flow reattachment can be visualized using infrared thermography. For the ribbed case, the heat transfer contours were reported based the regions between ribs. Square brass ribs were used and the rib height-to-hydraulic diameter ratio was 0.05. The rib pitch-to-height ratios were 10 and 20 in the current study. For the mist flow in the ribbed duct, the intense flow mixing and secondary flow caused by the ribs blew away liquid films on the surface. The heat transfer enhancement near the reattachment region was mainly influenced by the droplet impingement on the surface. In the ribbed duct, the heat transfer enhancement from using the mist flow was 2.5 to 3.5 times higher compared to the air flow.

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