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Keywords: Nusselt number
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Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. September 2022, 144(9): 094502.
Paper No: HT-22-1012
Published Online: June 22, 2022
... 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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. July 2022, 144(7): 072901.
Paper No: HT-21-1680
Published Online: April 20, 2022
...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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. June 2022, 144(6): 062601.
Paper No: HT-21-1551
Published Online: April 5, 2022
... 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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. May 2022, 144(5): 052101.
Paper No: HT-21-1420
Published Online: March 1, 2022
... 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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2022, 144(4): 042001.
Paper No: HT-21-1404
Published Online: January 25, 2022
... 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...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. November 2021, 143(11): 112902.
Paper No: HT-20-1550
Published Online: September 22, 2021
... 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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. August 2021, 143(8): 082601.
Paper No: HT-20-1789
Published Online: June 17, 2021
... 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...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. June 2021, 143(6): 063301.
Paper No: HT-20-1209
Published Online: April 21, 2021
... 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...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2021, 143(4): 042602.
Paper No: HT-20-1514
Published Online: February 22, 2021
...), 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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2021, 143(2): 021801.
Paper No: HT-20-1044
Published Online: November 16, 2020
... 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...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. October 2020, 142(10): 102106.
Paper No: HT-20-1042
Published Online: July 17, 2020
...-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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. June 2020, 142(6): 061805.
Paper No: HT-19-1707
Published Online: April 27, 2020
... to the laminar region (see Sec. 4 ). In contrast to Whitaker, Churchill [ 2 ] proposed a continuous correlation to predict the local Nusselt number, Nu x , from laminar flow, through the transition region, and into the turbulent region. He used an algebraic combining formula to smoothly join a laminar...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. June 2020, 142(6): 062501.
Paper No: HT-19-1609
Published Online: April 24, 2020
... 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...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2020, 142(2): 022501.
Paper No: HT-19-1004
Published Online: December 6, 2019
... of 0.2-m diameter of curvature, and also a 50-Hz alternating magnetic field is applied to the curved pipe, the results reveal that using a 0.4% ferrofluid, Nusselt number is improved by 32% compared to that of the distilled water. Nevertheless, due to the undesirable influence of pressure gradient...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. December 2019, 141(12): 122504.
Paper No: HT-19-1129
Published Online: October 8, 2019
...U. Madanan; R. J. Goldstein The effect of sidewall conductance on Nusselt number for the Rayleigh-Bénard convection is examined by performing nearly identical sets of experiments with sidewalls made of three different materials. These experimental results are utilized to extrapolate and estimate...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. August 2019, 141(8): 084501.
Paper No: HT-18-1595
Published Online: June 12, 2019
... recommended, rectangular, trapezoidal, triangular, and sinusoidal shapes. In addition, an artificial roughness has been introduced to improve heat transfer within corrugated channel. In the second part, a corrugated wall was used at the inlet channel. Numerical results are presented as Nusselt number (Nu...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. August 2019, 141(8): 081801.
Paper No: HT-18-1709
Published Online: June 12, 2019
... 7, 2019; published online June 12, 2019. Assoc. Editor: Danesh K. Tafti. 29 10 2018 07 05 2019 perforated twisted tape with V cuts twist ratio Nusselt number friction factor entropy generation The quality of thermal energy output of any thermodynamic system...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2019, 141(4): 041701.
Paper No: HT-18-1592
Published Online: February 25, 2019
... (CWT) and constant heat flux condition (CHF) prescribed on the disk surface. Extensive results are presented in terms of the local and average Nusselt numbers to delineate the effect of each of the influencing parameters, Re, Pr, n, t/D for each thermal boundary condition. Limited results are also...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2019, 141(4): 042001.
Paper No: HT-18-1246
Published Online: February 25, 2019
.... A distinct feature of these MHD problems, not yet addressed in the literature, is that unlike the conventional characterization of heat transfer by a Nusselt number, it is necessary to generalize the concept to vectors and matrices of Nusselt coefficients, due to the extreme anisotropy of both the flow...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2019, 141(2): 022404.
Paper No: HT-17-1401
Published Online: December 19, 2018
...Sunil K. Dwivedi; Sandip K. Saha This experimental study on rhombic shaped microchannels was conducted to understand the effect of a low acute side angle on the Nusselt number and compare the results with the published numerical results for H1 (axially constant heat flux and circumferentially...