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HiTRAN
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When fluid flows through a plain tube the fluid
nearest the wall is subjected to frictional drag, which has the
effect of slowing down the fluid at the wall. This laminar
boundary layer can significantly reduce the tube-side heat
transfer coefficient and consequently, the performance of the heat
exchanger.
Inserting correctly profiled HiTRAN®
Matrix Turbulators into the tube will disrupt the laminar boundary
layer, creating additional fluid shear and mixing, thereby
minimizing the effects of frictional drag.
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HiTRAN®
tube inserts are particularly effective at enhancing heat
transfer efficiency in a plain tube design operating at low
Reynolds Numbers (laminar to transitional flow.) Although the heat
transfer increase is greatest in the laminar flow region (up to 20
times), significant benefits can be obtained in the transitional
flow regime (up to 15 times) and turbulent flow regime (up to 3
times.) In fact, Cal Gavin have installed
HiTRAN®
Thermal Systems in heat exchangers operating between Reynolds
numbers 1 to over 100,000.
Whilst there is an increase in frictional resistance associated
with HiTRAN®
Thermal Systems, the amount of enhancement is such that solutions
can be found which offer increased heat transfer at equivalent or
lower pressure drop than a plain tube (this is demonstrated in
our case studies.)
Advanced
Heat transfer Technology
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