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Heat transfer Enhancement against Void Fraction in Flow Boiling of R407C using Twisted Tapes
, Ramakant Shrivastava
Published in Blue Eyes Intelligence Engineering& Sciences Publication
Volume: 8.0
Issue: 1.0
Pages: 1858.0 - 1866.0
Heat transfer enhancement with respect to void fraction (i.e. vapor quality) is investigated in a flow boiling of R407C using twisted tapes in a tubular evaporator of 13.40 mm inner diameter and 2m length. Following operating conditions are considered for investigations: (i) heat flux – 1.5 to 9.5 kWm-2; (ii) mass flux - 150 to 300 kg s-1 m-2; (iii) evaporating temperature ranging from -150C to +150C; (iv) average void fraction( vapor quality) -0.05 to 0.90. Heat Transfer enhancement due to twisted tapes is found to be varied with respect to void fraction (vapor quality) and operating conditions. 10 to 40% void fraction is found to be most suitable range for heat transfer enhancement for all operating conditions. Twisted tapes of twist ratio 12, 10 & 8 are compared for their heat transfer performance. Twisted tape of twist ratio 12 has shown maximum heat transfer enhancement.
About the journal
JournalInternational Journal of Recent Technology and Engineering (IJRTE)
PublisherBlue Eyes Intelligence Engineering& Sciences Publication
Open Access0