The rectangular two-phase closed thermosyphon: A case study of two-phase internal flow patterns behaviour for heat performance

• Autorzy: Chompookham Teerapat , Sichamnan Surachet , Bhuwakietkumjohn Nipon , Parametthanuwat Thanya

Identyfikatory

DOI

10.24425/ather.2020.134578

• Języki publikacji: EN

Abstrakty

EN

This research explored different types of two-phase flow patterns that influenced heat transfer rate by assessing rectangular two-phase closed thermosyphon (RTPCT) made from glass with the sides of equal length of 25.2 mm, aspect ratio 5 and 20, evaporation temperature of 50, 70, and 90°C, working substance addition rate of 50% by volume of evaporator, and water inlet temperature at condensation of 20°C. Upon testing with aspect ratios 5, three flow patterns emerged which were: bubble flow, slug flow and churn flow respectively. As per the aspect ratio 20, four flow patterns were discovered which were: bubble flow, slug flow, churn flow and annular flow, respectively. Aspect ratio 5 pertains characteristic which resulted in a shorter evaporation rate of the RTPCT than that of the aspect ratio 20, thus, a shorter flow distance from the evaporator section to heat releaser was observed. Therefore, flow patterns at aspect ratio 5 exhibited a faster flow velocity than that of the aspect ratio 20. Furthermore, changes of flow pattern to the one that is important for heat transfer rate can be easily achieved. Churn flow was the most important type of the flow for heat transfer, followed by slug flow. Moreover, with aspect ratio 20, annular flow was the most important flow for the heat transfer, followed by churn flow, respectively. Throughout the test, average heat flux as obtained from the aspect ratio 5 were 1.51 and 0.74 kW/m2 which were higher than those of the aspect ratio 20. The highest heat flux at the operating temperature of the evaporator section was 90°C, which was equivalent to 2.60 and 1.52 kW/m2, respectively.

Słowa kluczowe

EN

internal flow; flow pattern; rectangular two-phase closed thermosyphon

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2020
• Tom: Vol. 41, no 3
• Strony: 223--254
• Opis fizyczny: Bibliogr. 45 poz., rys., tab., wykr., wz.

Twórcy

autor

Chompookham Teerapat

• Heat-Pipe and Thermal Tools Design Research Unit (HTDR), Department of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Thailand

autor

Sichamnan Surachet

• Heat-Pipe and Thermal Tools Design Research Unit (HTDR), Department of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Thailand

autor

Bhuwakietkumjohn Nipon

• Heat Pipe and Nanofluid Technology Research Unit, Faculty of Industrial Technology and Management, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand

autor

Parametthanuwat Thanya

• Heat Pipe and Nanofluid Technology Research Unit, Faculty of Industrial Technology and Management, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand

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