Design And Analysis Of A Concentric Tthex, Triple Tube Heat Exchanger, For Better Heat Transfer With Enhanced Thermal Performance Using Computational Fluid Dynamics

Abstract

For the goal of improving thermal efficiency, mathematics and computationally fluid dynamics assessments of several designs of a circumferential TTHEX were done.A total of five designs have been used to check its thermal performance for the same boundary conditions at various concentration ratios ofgraphenenanoplatelets–platinumnanofluid for this The momentum boundary condition with no slip is set for solid walls whereto achieve adiabatic conditions, the heat flows is for an outside lateral wall is set to zero, while the inner tube walls and baffles are coupled. In the computational domain, fluency software is often used to estimate fluid's heat transfer characteristics. The system of equations is continuously solved using the SIMPLE algorithm and finite volume formalism. Because the swirling impact on the turbulent boundary layer has more precision than the normal k-epsilon model, the RNG k-epsilon model is used for turbulent flow, and the second order optimization algorithm is utilized for movement energetic turbulent and its distribution function. Results show that TTHEX with inclined baffle at 75o gives a maximum outlet temperature for nanofluid of 20.77oK for phai = 0.1, which is 21.71% greater than without baffle, 33.56% greater than straight baffles and 20.58% greater than baffles inclined at 60o. The heat transfer rate of 17.98% higher than without baffle, 27.79% higher than straight baffle and 17.04% higher than baffles inclined at 60o, while the maximum overall heat transfer coefficient of 0.9832 for phai = 0.1 have been observed. Hence concentric TTHEX with inclined ribs at 75o recommended for better heat transfer.