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Cold fluid was flowed through pipeline whereas hot fluid was flowed through the side from side in a side-tee pipeline formation. Experiments were carried out reading temperature of downstream flow for varied velocities. Computational fluid dynamics package was used for geometry creation, mesh generation, and defining the control volume for computations according to the experimentations for varied velocities. Results validated the model and scale up of the geometry was made whereas the diameter ratio constant was kept constant for creation of scale-up geometry. For the scale-up geometry for varied velocities, computations are performed too and heat transfer mixing position is located for both cases for various velocities. For scale-up geometry, it is plotted that downstream heat transfer mixing position is lengthily distanced. Earlier mixing is attained for lower velocities comparatively.
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