NUMERICAL SIMULATION AND ANALYSIS OF HEAT TRANSFER FOR DIFFERENT GEOMETRIES OF CORRUGATED TUBES IN A DOUBLE PIPE HEAT EXCHANGER

Yıl 2019, , 293 - 301, 24.06.2019

Morteza Bayareh

https://doi.org/10.18186/thermal.581775

Cited By: 10

Öz

In the present study,
effect of different geometries of inner and outer tube surfaces on heat
transfer of a double pipe heat exchanger is studied. Water-CuO nanofluid, that
is assumed to be a single phase, flows in the outer tube. Two-equation standard
κ-ε turbulence model is used to model the turbulent flow.
Simulations are done for different cases include convex, concave and smooth
surfaces for inner and outer tubes at different Reynolds numbers. Results show
that the maximum heat transfer corresponds to the convex-concave case in
comparison with the smooth-smooth one. Heat transfer rate increases with the
Reynolds number, but the slope of the increase for nanofluid is lesser than
that for the pure fluid. It is demonstrated that the friction factor decreases
with the Reynolds number, so the pressure drop decreases as the Reynolds number
increases. Also, the simulations are done for two other nanofluids, water-ZnO
oxide and water-Si



















 dioxide with a volume fraction of
3%. It is found that water-CuO nanofluid flow leads to more heat transfer rate
in a double pipe heat exchanger in comparison with the other nanofluids.

Anahtar Kelimeler

Heat Exchanger, Surface Geometry, Heat Transfer, Nanofluid, Friction Factor

Kaynakça

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