Research Article
CFD Analysis for Heat Transfer Enhancement inside a Circular Tube with Half-Length Upstream and Half-Length Downstream Twisted Tape
Table 1
The highest recorded heat transfer enhancement level estimated due to each enhancer, (Siddique et al. [
3]).
| Heat transfer enhancer type | (Heat transfer due presence of the enhancer/heat transfer in absence of the enhancer) |
| Fins inside tubes | 2.0, [4] | Microfins inside tubes | 4.0 for laminar, [5] | Porous media | 12.0 (keff/kf), [6] | Nanofluids | 3.5, [7] | Flexible seals | 2.0, [8] | Flexible complex seals | 3.0, [9] | Vortex generators | 2.5, [10] | Protrusions | 2.0, [11, 12] | Ultra high thermal conductivity composite materials | 6, [13] |
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