Two-phase flow patterns and heat transfer characteristics of R134a refrigerant during flow boiling in a single rectangular micro-channel

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Keepaiboon C., Wongwises S.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2015

วารสาร: Experimental Thermal and Fluid Science (0894-1777)

Volume number: 66

หน้าแรก: 36

หน้าสุดท้าย: 45

จำนวนหน้า: 10

นอก: 0894-1777

eISSN: 1879-2286

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84926288390&doi=10.1016%2fj.expthermflusci.2015.02.004&partnerID=40&md5=b2385c53f16822a26ceeb2b515275d5c

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

In this paper, flow patterns and heat transfer characteristics of R134a refrigerant during flow boiling in a single rectangular micro-channel with 0.68mm hydraulic diameter are investigated. In this experiment, heat transfer coefficients were studied at a heat flux range of 7.63-49.46kW/m2, mass flux range of 600-1400kg/m2s, and saturation temperature range of 23-31ฐC. Results show that there are six different flow patterns occurring during boiling of R134a refrigerants: bubbly flow, bubbly-slug flow, slug flow, throat-annular flow, churn flow, and annular flow. It is also found that flow pattern has a significant relation to heat transfer coefficients. In low heat flux range, variation of mass flux has no significant effect on the heat transfer coefficient. It corresponds to the nucleate boiling heat transfer mechanism in which its flow patterns are bubbly flow, bubbly-slug flow, slug flow, throat-annular flow, and churn flow. The heat transfer coefficient at higher saturation temperatures is greater than that of lower saturation temperatures. In high heat flux ranges, the heat transfer coefficient increases with increasing mass flux. It corresponds to the convective boiling heat transfer mechanism in which its flow pattern is annular flow. Increase of saturation temperature causes the heat transfer coefficient to decrease. At very high saturation temperature, a partial dry-out occurs that results in a lower heat transfer coefficient. ฉ 2015 Elsevier Inc.

คำสำคัญ

Flow patterns