... and fluid behavior when the slot jet is offcenter, during impingement cooling. Several turbulence models from the k– ε and k– ω families were compared by evaluating the local Nusselt number profiles at different locations around the cylinder, and these results were compared to experimental data...

...-mail:  satyenders@nitj.ac.in 05 05 2022 08 10 2022 17 11 2022 circular jet impingement turbulence heat transfer solar air heater thermal performance Solar air heaters have gained much attention due to simplicity in their design and coverage of broad range of thermal applications...

... Ravigururajan and Bergles correlation, by adopting the Churchill model to calculate the smooth-tube friction factor and by using the hydraulic diameter in the Reynolds number, can predict single-phase turbulent frictional pressure drop data relatively well. Eleven pressure drop correlations were evaluated...

...Yacine Halouane; Amina Mataoui; Farida Iachachene The interaction of a turbulent axisymmetric jet issuing into a cylindrical hot cavity was investigated numerically using the RSM. The effects of Reynolds numbers and impinging distance on the flow fields and heat transfer were examined...

...; published online November 7, 2013. Assoc. Editor: James A. Liburdy. 22 01 2013 10 07 2013 The effect of the uniform fluid properties approximation (Oberbeck-Boussinesq (OB)) in turbulent mixed convection is investigated via direct numerical simulation (DNS) of water flows with viscosity...

... from 1 mm to 2.5 mm) are numerically predicted using commercial computational fluid dynamics (CFD) code, Ansys cfx . The turbulent model employed is the k–ω based shear–stress transport (SST) model with automatic wall function treatment. In the performance evaluation, we use a “universal” porous media...

..., is selected as the calculation domain. The liquid flow inside the fibers is assumed to be laminar due to the low Reynolds numbers, while the air flow across the bank is considered to be turbulent as a result from the disturbances from the numerous fibers. The governing equations for fluid flow and heat...

...Koji Matsubara; Atsushi Sakurai; Takahiro Miura; Takuya Kawabata The near-wall turbulent heat transport of the three orthogonal directions was directly solved for the Prandtl numbers ranging from 0.025 to 5.0 to validate the algebraic models of the turbulent heat flux. Two kinds of thermal...

...Jayathi Y. Murthy; Sanjay R. Mathur During the few decades, computational techniques for simulating heat transfer in complex industrial systems have reached maturity. Combined with increasingly sophisticated modeling of turbulence, chemistry, radiation, phase change, and other physics, powerful...

...Nobuhide Kasagi; Yosuke Hasegawa; Koji Fukagata; Kaoru Iwamoto Because of the importance of fundamental knowledge on turbulent heat transfer for further decreasing entropy production and improving efficiency in various thermofluid systems, we revisit a classical issue whether enhancing heat...

... is the thermal mixing in the water pool, and the other is the thermo-hydraulically induced mechanical loads acting on the structures of relevant systems. The two concerns are inter-related and can be well described only if the local behavior of the condensing steam jets and the resultant turbulent jet in a pool...

... on the current state of the art in various areas. Besides those mentioned above, the topics include turbulent flows, porous media transport, experiments in space, multiscale problems, computational heat transfer, food processing, transport in microchannels, inverse problems, phase-change, and many others...

...Pedro J. Coelho Theoretical analysis and experimental investigations have shown that the mean heat fluxes in turbulent gaseous flows are influenced not only by the mean scalar fields (temperature and molar fraction of the species) but also by the scalar fluctuations. It is widely recognized...

... components. This enables a detailed comparison of URANS and LES to assess the URANS modeling assumptions as well as a flow decomposition with respect to the flow structure’s influence on surface heat transfer. This analysis shows low order modes which do not contribute to turbulent heat flux, but instead...

... rate of 19.5 mg/s compared to measured values of 63 K and 19.4 mg/s, therefore, showing that conventional macroscale correlations can hold well for turbulent microscale flow and heat transfer as long as the validity of the assumptions is verified. Cryosurgery is a surgical method, which involves...

...Zhipeng Duan Fully developed turbulent flow in noncircular ducts is examined, and simple models are proposed to predict the friction, heat and mass transfer in most common noncircular channels. It is found that the square root of cross-sectional area is the relatively more appropriate length scale...

... factors increased with rotation number due to the increased Sherwood number ratios and decreased friction factor ratios. 30 08 2010 12 08 2011 27 10 2011 27 10 2011 channel flow gas turbines heat transfer mass transfer rotational flow swirling flow turbulence gas...

... loop model is set up and the effect of pipe diameter is systematically analyzed. Finite volume method is used to solve the conservative equations with supercritical turbulence model incorporated. It is found that supercritical CO 2 thermosyphon can achieve high Reynolds flow as 104–105 even temperature...

... the internal semicircular channel to promote the heat transfer at different jet Reynolds numbers ( Re jet = 1000–5000). Three turbulence models, namely, the standard k – ɛ, k – ω and the Reynolds stress model (RSM) have been investigated in the present paper by comparing Nusselt number and normalized pressure...

... external flows flow simulation heat exchangers laminar flow mechanical engineering computing numerical analysis pipe flow turbulence volume averaging theory closure field synergy principle fin-and-tube heat exchanger representative elementary volume Volume averaging theory (VAT...