... with the separation of variables method. Expressions for the Nusselt number, the nondimensional entropy generation rate, and the Bejan number were further deduced. The influences of crucial factors, including viscous dissipation, rarefaction, aspect ratio, and fluid axial heat conduction, have been carefully...

... distinct asymptotic regions, with the first one representing fully developed heat transfer and the second one representing isothermal states. The fully developed Nusselt number ( N u fd ) is found to rise first, before dropping continuously with rise in Knudsen number ( Kn ) . The pair of K n and maximum N...

... of psychrometric data. The results show that the Sherwood number and the Nusselt number reach a steady value after an initial transient period for the drop subjected to Hagen-Poiseuille flow. A parametric study is conducted to investigate the effect of drop deformation on the rate of evaporation. It is observed...

... redistribution at a plane, which is beneficial, (b) the statistical axial-velocity deviates from the standard logarithmic law at a Reynolds number of 5000, and (c) the ratio of surface-area-averaged Nusselt number between the lower half and upper half of the tube is 4–12. Some important recommendations...

..., 1/2, and 3/4 on the cooling process are studied. The distributions of surface temperature are acquired experimentally using a thermal infrared camera. As well, the local Nusselt number (Nu), stagnation point Nusselt number ( Nu st ), average Nusselt number ( Nu ¯ ), and average Nusselt number ratio...

..., thermal conductivity ratio, thickness ratio, and Reynolds number on peripheral heat flux, temperature, and Nusselt number profiles. Isotherms show a multidirectional thermal gradient for low thermal conductivity ratios, whereas only an axial thermal gradient is seen for higher thermal conductivity ratios...

...Shailesh Kumar Shakya; Yadaba Mahanand; Jnana Ranjan Senapati This study analyzes the thermo-fluid characteristics of the solar air heater duct (SAHD) consisting of W-shaped transverse ribs on the collector plate. The results of the study are presented with the appearance of Nusselt number...

... in experimental data reduction, leading to apparently very low Nusselt number estimation. Moreover, this erroneous data interpretation is also linked to the prediction of a strong Reynolds number dependency of the average Nusselt number in the laminar flow regime. e-mail:  anakin@iitkgp.ac.in 1...

...Satish Upadhyay; Pankaj Rajendra Savant; Laltu Chandra; Jahar Sarkar The turbulent flow of binary hybrid nano-oils is investigated and Nusselt number correlation is developed for futuristic concentrated solar thermal application. Available Nusselt number correlations for water-based hybrid...

... generation due to heat transfer and fluid friction and the total entropy generation are determined for different parameters. The results are presented graphically in streamlines, isotherms, and average Nusselt numbers. Three different configurations of active region arrangement are considered in this study...

... at the microscale, are also contained in the analysis. Momentum and energy equations are solved analytically under second-order slip velocity and temperature jump boundary conditions. Closed type answers for the temperature field and the fully developed Nusselt number are derived as a function of the magnetic...

... can improve the comprehensive heat transfer performance parameter (Φ), and the maximum increases of Φ are 11.0%, 14.3%, 12.2%, and 14.7% for SC, SR, SD, and SFS cases, respectively. It is noted that the Nusselt number of heated SFS-shaped diverter surface is also the highest. Besides, the influences...

... Nusselt number (Nu avg ), friction coefficient ( C f,avg ), and maximum temperature ( T ¯ max ) are optimized. The operating parameters considered for optimization include heat generation term ( S ¯ q ), Reynolds number (Re), conduction-convection parameter ( ζ cc ), aspect ratio (Ar), and spacing between...

... clockwise (CW), whereas, in the other two cases, cylinders rotate in opposite directions (CW–CCW and CCW–CW). Simulations have been carried out over a broad range of Reynolds number (from 0.5 to 500) and angular speeds (a dimensionless value from 0 to 10). The average Nusselt number values at the isothermal...

... using split shows better result with the highest heat transfer increment of nearly 25%. Further, in order to maximize Nusselt number (Nu), a single objective cuckoo search optimization analysis is done by adopting the response surface method. After analyzing the optimization, it is found...

...), angular pitch ( θ ), cylinder length to diameter ratio (L/D), and Rayleigh number (Ra) spanning from 0.005 to 0.08, 0.1 to 0.3333, 30 deg to 180 deg, 2 to 20, and 10 4 to 10 8 , respectively. It has been found that the average surface Nusselt number (Nu) for the outer surface increases with the diameter...

... wall temperature boundary, unyield region of temperature-dependent model at rear of circular tube is smaller due to a higher shear rate and lower average viscosity. On the surface of circular tube, local skin drag coefficient first increases and then decreases, and local Nusselt number decreases near...

...-shaped rib design was performed using various geometric parameters related to the heel-angle, toe-angle, slope-height, and rib-width to find their effect on the Nusselt number, temperature on the ribbed wall, friction factor ratio of the channel, and thermal performance factor. The numerical results...

... upstream of Re l ; and, at Re l , the Nusselt number of Eq. (9) is 7% greater than the laminar Nusselt number. Mayle [ 42 ] and Blair [ 34 ] discuss procedures for estimating the onset of transition from the local value of u ′ r / u ∞ . Most...

... nonuniformity reduces 7.6 °C, 24 °C, and 7.4 °C by the MPFHS MI,F , MPFHS MI,FH , and MPFHS MI,SH designs, respectively. Average Nusselt number for the cases MPFHS MI,F , MPFHS MI,FH , and MPFHS MI,SH is found 26.7%, 52.3%, and 70.9% higher than the conventional design of MPFHS. Overall thermal performance...