... flow theory. For this purpose, the pressure drop, friction factor, and Poiseuille number under isothermal conditions and the temperature profile, heat transfer coefficient, Nusselt number, and thermal performance index under diabatic conditions (heating power of 10 W) in a heat sink with a stainless...

... of experiments on total heat transfer and short-circuit heat transfer, the Nusselt number can be calculated. The pressure drop across a bayonet tube determined the friction factor. In examining a range of Reynolds numbers, Effectiveness and figure of merit have been resolved. It has been observed...

..., friction factor, thermo-hydraulic performance parameter (THPP), and contours of various fluid properties. Different roughness and flow parameters are considered for the computational study, like Reynolds number (Re) and nondimensional pitch (P/e). Re changes from 3800 to 18,000, and the nondimensional...

... in supercritical CO 2 thermal cycles and require accurate correlations and comprehensive performance modeling under extreme temperatures and pressures. In this paper (Part I), new Colburn and friction factor correlations are developed to quantify shell-side heat transfer and friction characteristics of flow within...

.../j.tsep.2019.100436 [14] Medina , Y. C. , Fonticiella , O. M. C. , and Morales , O. F. G. , 2017 , “ Design and Modelation of Piping Systems by Means of Use Friction Factor in the Transition Turbulent Zone ,” Math. Modell. Eng. Probl. , 4 ( 4 ), pp. 162 – 167 . 10.18280...

.... 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 is important to assess the actual performance of the system under the specified...

... rectangular with hydraulic diameters of 0.8–1.33 mm and aspect ratio of 0.44–0.94. The working fluid was water, and the Reynolds number was in the range 150–4500. The experiment result showed that friction factor was successfully predicted by classical correlation in laminar regime, whereas the laminar...

... angle beyond approximately 35 deg does not have a noticeable effect on the value of f Re. The friction factor profile has a small slope for porosity less than 0.5, but for ε  > 0.5, f Re is approximately constant. The value of f Re versus permeability varies slightly up to a certain point, beyond...

... are the most widely cited and trusted for this configuration. The uncertainty in the correlation for the average heat transfer of a tube in an inner row of a staggered bank of smooth tubes provided by the Zukauskas and Ulinskas correlation is ± 15 % , however, that for the friction factor does...

...D. A. Cruz; P. M. Coelho; M. A. Alves In this work, we propose an approximate methodology to estimate the Nusselt number and friction factor in fully developed non-Newtonian laminar flow in circular pipes for a constant wall heat flux. The methodology was tested using several constitutive equations...

... mean heat transfer coefficients and friction factors. A validated numerical method is also utilized to provide local information. The measured results show that the performance of the DN plate approaches that of the double undulated (DU) plate and lies between that of the cross corrugated (CC) plate...

... of the underlying convective heat transfer mechanisms in the pin fin-dimple channels and improving the cooling design for the gas turbine components. The flow structure, friction factor, and heat transfer performance of the pin fin-dimple channels with various dimple depths have been obtained and compared with each...

... showed that perforated twisted inserts of different geometry in a circular tube enhanced the heat transfer rate with an increase in friction factor and pumping power for turbulent flow. The pumping power, heat transfer coefficient, and effectiveness in the tube with the twisted tape inserts are found...

... factor correlations for low Reynolds number ( Re < 1000 ) flow in conventional and micro-pin-fin arrays were examined and found underpredicting the adiabatic data except the correlation by Short et al. (2002, “Performance of Pin Fin Cast Aluminum Coldwalls, Part 1: Friction Factor Correlation,” J...

... ranging from 3.8 to 167 W ∕ cm 2 and Reynolds numbers from 14 to 112. The results were used to derive the Nusselt numbers, total thermal resistances, and friction factors. It has been found that for Reynolds numbers below ∼ 50 long tube correlations overpredicted the experimental Nusselt number, while...

... trapezoidal channel entrance region friction factor heat transfer coefficient Laminar flow and heat transfer in channels of arbitrary cross section have received considerable attention over the years due to their obvious practical importance. Shah and London ( 1...

...) are selected, with nonequilibrium wall functions approach (if applicable). The periodic mean values of the friction factor and the wall Nusselt numbers in the hydro and thermally developing entrance region are studied, with the determination of the distribution of time-averaged temperature and velocity...