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Analytical Approximations
Published in Vasilios Alexiades, Alan D. Solomon, Mathematical Modeling of Melting and Freezing Processes, 2018
Vasilios Alexiades, Alan D. Solomon
Several mechanisms, such as radioactive decay, electrical resistance heating or irradiation (by light, microwaves, etc), provide energy directly to each point of the material, thus generating internal heating. We consider the following simple
Frequency response of three-dimensional natural convection of nanofluids under microgravity environments with gravity modulation
Published in Numerical Heat Transfer, Part A: Applications, 2023
In each volume fraction at a time variation of with the gravity modulation occurs, but Nuav does not change with time. That is, the time change of due to the gravity modulation does not affect Nuav. This is because the poor followability of fluid to the gravity modulation suppresses the fluctuation of convection velocity due to the gravity modulation and velocity fluctuations do not affect the heat transport near the wall surface. In addition, and Nuav decrease monotonically with increasing because the increase in the viscosity coefficient of the nanofluid with increasing suppresses the convection. Malashetty and Padmavathi [56] clarified from a linear stability analysis that the effects of gravity modulation disappeared at high frequencies for a fluid and porous layer without nanoparticles. Bhadauria et al. [19] studied the combined effect of internal heating and time-periodic gravity modulation on thermal instability using weakly nonlinear stability analysis and found that when the frequency increased, the magnitude of the Nusselt number decreased and the effect of gravity modulation on heat transport decayed. The present results for nanofluids agree well with earlier studies on pure fluids without nanoparticles [19, 56].
Effect of movable insulation on performance of the Building integrated Semi-transparent Photovoltaic Thermal (BiSPVT) system for harsh cold climatic conditions: a case study
Published in International Journal of Ambient Energy, 2022
Neha Gupta, Pooja Rani, G. N. Tiwari
The following assumptions have been made to establish the energy balance equations for the proposed system. The system is considered to be in a steady state.The heat losses from side walls of the room are neglected.Movable insulation has been used during off-sunshine hours/low intensity.Heat capacity of all materials used is neglected except water mass due to the internal heating of room.There is no stratification in water mass due to small thickness.
Computation of heat transfer in magnetised Blasius flow of nano-fluids with suspended carbon nanotubes through a moving flat plate
Published in International Journal of Ambient Energy, 2022
M. Ferdows, MD. Shamshuddin, S. O. Salawu, Motahar Reza
The computed graphical results for and along the free stream boundary wall distance are obtained in Figures 8–10. With rising temperature exponent under various flow conditions and assumptions, the magnitude of the tangential flow field, velocity profile and temperature distribution upsurge within the boundless domain. The nano-fluid carbon suspension colloidal of the ethylene glycol and water increases in material conductivity and thermal convection strength as the temperature increases. The term propels internal heating and nano-particles’ heat transfer but discourages ambient heat diffusion as the multi- and single-walls dominate the flow system. Augmentation in the temperature exponent enhances heat distribution leading to a uniform reduction in the nano-particle bonding influence. These cause a steady flow of the carbon nano-liquid with little or no resistance, as confirmed in Figures 8 and 9. However, the parameter variation considerably influences the nanoparticles’ thermal conductivity that boosts the temperature field as heat is generated in the flow region by an increasing heat exponent.