Review Paper On Heat Transfer Enhancement In Heat Exchanger Tubes By Different Passive Methods
Journal Title: International Journal of Management, IT and Engineering - Year 2017, Vol 7, Issue 10
Abstract
Heat Transfer Enhancement plays important role in heat exchangers of modern process plant equipments. Passive techniques for heat exchangers enhancements are more applicable as there are wide variety of attachments available for heat transfer enhancement. Higher heat transfer coefficient can be obtained by using different techniquies of heat transfer enhancement, it reduces the required heat transfer area for same amount of heat transfer rate, At the same time these methods leads to higher pressure drop. Some methods of heat transfer enhancement are discussed here. Raj M. Manglik et al. [1] By generating helical swirling motion inside a tube with a twisted-tape insert, forced convective heat transfer was significantly enhanced. Heat transfer coefficient and friction factor correlations for both laminar and turbulent regimes were presented, and the damping effect of swirl on the transition region was highlighted. In flow boiling with net vapour generation, tape-twist-induced helical swirl pushes liquid droplets from the core to the wall to enhance heat transfer and delay dry out. In sub-cooled boiling, the radial pressure gradient due to the swirl promotes vapour removal from the heated surface to retard vapour blanketing and accommodate higher heat fluxes.
Authors and Affiliations
Sanjay H. Zala
Keywords
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