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The effects of pitch and twist ratios on the heat transfer coefficient and pressure loss characteristics in the fully developed turbulent flow (12,000 7 Dimpled tube and twisted tape The augmentation may be attributed to the combined effect of induced swirl flow due to twisted tape and reduction in boundary layer thickness due to wall roughness (dimpled surface). 58 times of that in the plain tube. 0). This is so, since when the dimple pitch reduces, wall roughness increases, resulting in more turbulence in the boundary layer hence improving the heat transfer while increasing the frictional losses. 9 This improvement in heat transfer occurs, because as the twist ratio decreases, the fluid retention period increases, also turbulence intensifies with reduced twist ratio. Density and thermal conductivity has increased while specific heat has decreased slightly in comparison to base fluid. e. significant increase in viscosity is noticed. 1 5 Nano-Fluids, Next-Generation Heat Transfer Effect of Augmentation of Nano-Particle Concentration on Radiator Cooling Performance Keeping fluid inlet temperature at 44 °C and varying the nano-particle volume concentration, as shown in Fig. e. thermal performance of cooling system has improved (since from a practical viewpoint for every cooling system, at equal mass flow rate the more reduction in working fluid temperature indicates a better thermal performance of the cooling system).