CFD ANYSIS OF A DOUBLE PIPE HEAT EXCHANGER USING NANOFLUID

Abstract

Double pipe heat exchanger design is rather straightforward. It uses one heat exchanger pipe inside
another. After determining the required heat exchanger surface area, for either counter flow or parallel flow, the pipe
sizes and number of bends for the double pipe heat exchanger can be selected.
In double pipe heat exchanger design, an important factor is the type of flow pattern in the heat exchanger. A
double pipe heat exchanger will typically be either counterblow or parallel flow. Cross flow just doesn't work for a
double pipe heat exchanger. The flow pattern and the required heat exchange duty allow calculation of the log mean
temperature difference. That together with an estimated overall heat transfer coefficient allows calculation of the
required heat transfer surface area. Then pipe sizes, pipe lengths and number of bends can be determined.
The convective heat transfer, friction factor and effectiveness of different volume concentrations of Fe3O4 Nano
fluid flow in an inner tube of double pipe heat exchanger with return bend has been estimated experimentally and
turbulent flow conditions. The test section used in this study is of double pipe type in which the inner tube diameter is
0.019 m, the annulus tube diameter is 0.05m and the total length of inner tube is 5 m. At a distance of 2.2mfromthe inlet
of the inner tube the return bend is provided.
The hot Nanofluids flows through an inner tube, whereas the cold water flows through an annulus tube. The
volume concentrations of the nanoparticles used in this study are 0.03% and 8 lpm ,10 lpm mass flow rate with Reynolds
number range from 9,000 to 30,000.in the process analyzethe CFD analysis is performed in Ansys Fluent 15.0
workbench and its used different nanofluids used,which nanofluids better heat transfer rate find base on the results.In
this process choose different nanofluids( Al2o3, Cuo ,Fe3o4) this nanofluids properties taken by different base papers.