Water Flow Research Paper

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Study of Pressure Drop, Friction Factor& Heat Transfer Characteristics of Flat Rectangular Tube type Heat Exchanger Using CFD. A Review

ABSTRACT

This paper mainly focus on the different views and flows of flat rectangular tube heat exchangers using computational fluid dynamics (CFD). This literature review consists of flattened tubes with triangular cross-sections. The importance of heat exchangers has been increasing in automobile industry, aerospace industries and other industries for over fifty years due to several reasons specified below. A CFD methodology is used to get different curvature ratio of the amount of heat that is transferred, those characteristics can be found using ANSYS FLUENT 13.0. Normally, rectangular heat exchangers
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[2], conducted an experimental investigation of water flow through different shapes of microchannel cross section including circular, rectangular, trapezoidal and triangular. The hydraulic diameter of microchannels varied from 8 um to 42 um. They collected experimental data with the Reynolds number ranging from 0:1 to 2, and concluded that there was less influence of the cross-sectional shape on the microflow in the microchannel and the experiment data agreed well with the prediction of the convention theory. Baviere et. al. [24], performed an experimental study on the water flow through smooth…show more content…
It is also o shows that flow with high Reynolds Number is having higher Nusselt Number compare to the flow with lower Reynolds Number. It also observed that drop in Nusselt Number is more in the entry region and it becomes less in the exit region of the channel.

5.VARIATION OF PRESSURE DROP WITH RESPECT TO HYDRAULIC DIAMETER(Pascal)

Fig 5.1 : Pressure drop vs Hydraulic diameter

S.NO Hydraulic diameter (um) Pressure drop (kpa)

L=20mm L=30mm

1 50 200 400

2 66.67 450 900

3 75 200 550

From the figure [3] it is seen that for given hydraulic diameter, the pressure drop chances is more for larger channel length. It also observed that the variation of decrease in pressure at different levels at different hydraulic diameters are showing same trend for different channel length.

6.SKIN FRICTION COEFFICIENT

Fig 6.1 : skin

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