Friction factor characteristics for upward single-phase flows inside smooth and microfin tubes of a double-pipe heat exchanger for heating/cooling conditions
บทความในวารสาร
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
ไม่พบข้อมูลที่เกี่ยวข้อง
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: วebi A., Celen A., Dalkilic A.S., Wongwises S.
ผู้เผยแพร่: Begell House Inc.
ปีที่เผยแพร่ (ค.ศ.): 2013
Volume number: 20
Issue number: 5
หน้าแรก: 413
หน้าสุดท้าย: 425
จำนวนหน้า: 13
นอก: 1065-5131
eISSN: 1065-5131
ภาษา: English-Great Britain (EN-GB)
ดูในเว็บของวิทยาศาสตร์ | ดูบนเว็บไซต์ของสำนักพิมพ์ | บทความในเว็บของวิทยาศาสตร์
บทคัดย่อ
In this study, single-phase friction factor behavior of smooth and microfin tubes under heating and cooling conditions in a vertical pipe was investigated experimentally. A vertical double-tube heat exchanger in counterflow condition was used as a test section using pure water for both inner and annulus flows. Pressure drop measured by using differential pressure transmitter, and friction factor results were calculated and compared for both heating and cooling conditions and with different tube types. A smooth tube having the equivalent diameter with the microfin tube has been simulated by using two different smooth tube data and used for comparison with a microfin tube. As a result of the analyses, experimental friction factors were found to be in good agreement with those in the literature and correlated with various proposed empirical correlations for each investigated tube. During heating (aiding) conditions of the pure water in the inner tube, friction factors have larger values than those for the cooling (opposing) conditions due to the alteration of physical properties of pure water. Alteration of obtained friction factors by proposed correlations with mass flux and Reynolds number was also given in the paper. ฉ 2013 by Begell House, Inc.
คำสำคัญ
Diabatic pressure, Microfins, Rough surfaces