Research Projects

The present proposed work includes the improvement of heat transfer mechanism in the decay heat exchanger use in nuclear power plants. In present situation the decay heat exchanger is employed with looping tubes passing ambient air through power plant equipment to transfer the excess heat generated from NPP where in emergency or overload condition there may be need to remove excess heat from the power plant equipment. In this research a numerical assessment of the Heat transfer in similar scenario will be investigated using Flow over spheres, mechanism the heat transfer and flow structures around the bluff bodies are widely investigated problem due to its many applications. The flow separation complexity and Von Karman vortex shredding mechanism generated by sphere and an array of spheres have attracted large attention. In this the sphere will be introduced in the flow regime of the ambient airflow tubes where spheres are connected as a heat conducting element to power plant equipment and then flowing ambient air over the spheres to observe and study the heat transfer characteristics using this mechanism. A comprehensive study including normalising of sphere to Tube diameter ratio and sphere diameter to pitch ratio will also be studied for different Reynolds numbers following the normalisation of the design parameters. In this system simulation will also be performed with sphere with perforation and sphere with dimples to investigate the effect of rough sphere in heat transfer regime all this comparison draws to best output mechanism which will be used to test the Same configuration with PCM sphere . Here in this scenario will use phase change materials to investigate the heat transfer effects while PCM is used instead of solid metal spheres with different Reynolds number which will be compared with heat transfer rates achieved from solid spheres. Once the simulation results are concluded an appropriate mechanism for experimentation will be adapted and 3D experimental setup will be designed to fabricate the system the final configuration with best output will be validated experimentally.

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