... Γ t = turbulent thermal diffusivity δ = amplitude Δ P wavy = pressure difference between inlet and outlet η blower = blower efficiency η motor = electric motor efficiency λ = wavelength μ...

... 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...

... % (13) 6 ≤ L f ≤ 12 ,   Nu 0 = 19 - L f 200 Re 0 . 77   with   a   maximum   error   of   3 % The interaction of a turbulent axisymmetric jet issuing into a cylindrical hot cavity was investigated numerically using the RSM...

...Francesco Zonta; Alfredo Soldati References [1] Wang , M. , Fu , S. , and Zhang , G. , 2002 , “ Large-Scale Spiral Structures in Turbulent Thermal Convection Between Two Vertical Plates ,” Phys. Rev. E , 66 , p. 066306 . 10.1103/PhysRevE.66.066306 [2] Hartmann , D. L...

... 16 04 2013 Greek Symbols α = turbulence model constant or scale attack angle β , β * = turbulence model constant φ 1 = represent any constant in the original k–ω model ( σ 1 , … ) φ 2 = represent any constant in the transformed k–ε model...

..., 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. 09 01 2011 08 08 2011 13 12 2011 13...

...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...

... 06 10 2011 computational fluid dynamics confined flow 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...

... with a shorter rib—and this results in a higher turbulence in the flow-field. Also, on decreasing the spacing ratio (P/e), the heat transfer enhancement is observed to increase because the area available for heat transfer increases due to the larger number of ribs in the channel. The large number of angled ribs...