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Many inserts are used for increasing the performance of double pipe heat exchangers that are mentioned in the
literature review. Most of them work as swirl generators helping in increasing the turbulence of flow. This causes
better mixing for flow and consequently increases the heat transfer rate and pressure drop. The goal of this thesis is to
study the effect of using twisted tape, with different twist ratios, on the heat transfer rate and the friction factor of the
inner tube of a double pipe heat exchanger. The aim is to decide on the optimum twist ratio resulting in the best heat
transfer rate. It is found that the efficiency of heat transfer of double pipe heat exchangers can be improved by using
twisted tape insert inside the inner tube. This causes better mixing for the flow and consequently increases the heat
transfer and pressure drop. The results show that, using twisted tape increases the heat transfer rate and friction factor
when compared with plain tube. As the twist ratio decreases, the heat transfer rate increases, but also leads to
increasing the friction factor. The twisted tape with ratio H=1.7 gives the highest Nu which is 1.8 times that of plain
tube at Re=18000 with the optimum thermal performance factor (PEC).
Product Details
- Published:
- 2021
- Number of Pages:
- 8
- Units of Measure:
- Dual
- File Size:
- 1 file , 3.5 MB
- Product Code(s):
- D-VC-21A-C036
- Note:
- This product is unavailable in Russia, Belarus
