... 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...

... in the available technical literature. e-mail:  ycamaraza1980@yahoo.com email:  abel@ugto.mx e-mail:  luis.luviano@ugto.mx 22 01 2021 03 05 2021 02 06 2021 friction factor equivalent roughness heat transfer coefficient average deviation rough tubes model In many...

... 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...

... 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...

... distribution, as well as the friction factor ( f Re) and Nusselt numbers in the channel for both Isoflux (Nu H ) and Isothermal (Nu T ) boundary conditions. The consistency of our findings has been verified with earlier results in the literature on empty triangular ducts, when the porosity in our models...

... coefficient and friction factor for cross flow over staggered cylinders, i.e., tube banks or pin fins, are made that experimentally close the VAT-based equations governing transport phenomena in the porous medium. Applications of heat transfer to or from a bank of tubes or pin fins in cross flow include steam...

...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...

... in detail. Practical engineering correlations for the entrance length, friction factor, and heat transfer coefficient are also provided. It is worth emphasizing that, in the present study, molecular diffusion of heat and momentum in the principal flow...

...) 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...