Abstract:
This paper is another hopeful attempt to explore some of the phenomena
observed in heat transfer enhancement by advanced heat transfer enhancers.
Here it is reviewed the research work on heat transfer growth in advanced
enhancers such as in fins and micro-fins, porous media, nanofluids, flexible
seals, flexible complex seals, vortex generators, protrusions and ultra-high
thermal conductivity composite materials heat exchangers. It illuminates the
application of enhanced heat transfer surfaces as well. In this paper, it has
been discussed on theoretical enhancement factors accompanying many heat
transfer correlations for each enhancer. Furthermore, the effects of heat
transfer enhancement and their applicability on the extended surfaces are also
illustrated in this paper. Therefore, it is conjectured that the heat transfer has
been tweaked night on 200% (2.0 times) for fins inside tubes when correlated
with a smooth tube, 350% (3.5 times) for nanofluids when compared with
normal fluid, 600% (6.0 times) for ultra-high thermal conductivity composite
materials when analyzed with regular material and 1200% (12.0 times) in
porous media when contrasted with general media.
