D. Senthil Kumar

Bio: D. Senthil Kumar is an academic researcher from Sona College of Technology. The author has contributed to research in topics: Heat transfer & Combined forced and natural convection. The author has an hindex of 7, co-authored 13 publications receiving 120 citations. Previous affiliations of D. Senthil Kumar include Indian Institute of Technology Roorkee.

Numerical Simulation of Double Diffusive Mixed Convection in a Lid-Driven Square Cavity Using Velocity-Vorticity Formulation

Abstract: In this article, convection driven by combined thermal and solutal concentration buoyancy effects in a lid-driven square cavity is examined using velocity-vorticity form of Navier-Stokes equations. The governing equations consist of vorticity transport equation, velocity Poisson equations, energy equation, and concentration equation. Validation results are discussed for convection due to heat and mass transfer in a lid-driven square cavity at Re = 500, Le = 2, and GRT = GRS = 100. These results indicate that the present velocity-vorticity formulation could predict the characteristic parameters of flow, temperature, and solutal concentration fields using a much coarser mesh compared to the mesh used in a stream function-vorticity formulation. The capability of the proposed algorithm to handle complex geometry is demonstrated by application to mixed convection in a lid-driven square cavity with a square blockage. The effect of buoyancy ratio on the convection phenomenon is discussed for buoyancy ratio var...

Experimental investigation on heat transfer characteristics of an oblique finned microchannel heat sink with different channel cross sections

Abstract: The heat transfer and flow characteristics of oblique finned microchannel heat sink with a dimension of 48 × 80 mm2 were investigated experimentally with different channel cross-sections. The three-channel cross sections were namely trapezoidal, square and semi-circle is analyzed by using Al2O3/water nanofluid with 0.25% volume fraction and water as a coolant. The experiments were performed with a constant mass flow rate of 0.1 LPM and varying heat flux ranging from 5.5 to 26.5 kW/m2. The temperature and pressure drop across the inlet and outlet of the microchannel heat sink were measured to obtain heat and flow characteristics. The result shows that trapezoidal cross-section performs better and it provides 8.5 and 10.3% increased heat transfer rate than square and semi-circle cross sections respectively. Similarly, it gives 6.6 and 8.2% increase in friction factor than square and semi-circle respectively. Also, the case with trapezoidal cross-section creates lesser thermal resistance and slightly higher pumping power among the three sections.

Effect of the Aspect Ratio of a Heated Block on the Interaction Between Inertial and Thermosolutal Buoyancy Forces in a Lid-Driven Cavity

Abstract: In this article thermosolutal buoyancy-induced fluid stratification in a lid-driven square cavity with a heated block at different aspect ratios is studied using velocity-vorticity form of Navier-Stokes equations. The governing equations consist of vorticity transport, velocity Poisson, energy and solutal concentration equations. Galerkin's weighted residual finite element method has been employed to solve the coupled and nonlinear governing equations. The effect of fluid stratification obtained as a result of interaction between inertial and thermosolutal buoyancy forces on convective heat and mass transfer has been analyzed in detail. Simulation results obtained for 0.5 ≤ Ri ≤ 10, −50 ≤ N ≤ 50, 50 ≤ Re ≤ 500, and 0.5 ≤ AR ≤ 2 indicate that Nusselt number variation is felt only at higher values of aspect ratio; whereas, there is a significant increase in Nusselt number at lower values of aspect ratios for the variation of Richardson number (Ri) and buoyancy ratio (N). A steep increase in Sherwood number ...

Numerical Study on Double Diffusive Mixed Convection with a Soret Effect in a Two-Sided Lid-Driven Cavity

Abstract: In the present study, a numerical analysis is performed to understand the mixed convection flow, and heat and mass transfer with Soret effect in a two-sided lid-driven square cavity. The horizontal walls of the cavity are adiabatic and impermeable, while vertical walls are kept at constant but different temperatures and concentrations. The vertical walls move in a constant velocity. According to the direction of the movement of walls, three cases have been studied for different combinations of parameters involved in the study. The governing unsteady equations are solved numerically by the finite volume method with the SIMPLE algorithm. The results are presented graphically in the form of streamlines, isotherms, and velocity profiles. Heat and mass transfer rates are reduced if both walls are moving the in same direction, while heat and mass transfer rates are enhanced if the walls are moving in the opposite direction.

Literature Survey of Numerical Heat Transfer (2000–2009): Part II

Abstract: A comprehensive survey of the literature in the area of numerical heat transfer (NHT) published between 2000 and 2009 has been conducted Due to the immenseness of the literature volume, the survey