... of liquid lithium in spiral tubes are not yet fully understood. This research establishes a non-isothermal heat transfer model incorporating a modified turbulent Prandtl number to analyze the flow of liquid lithium through spiral tubes with varying geometries. Numerical analysis is carried out focusing...

...Carolin Wüstenhagen; Clemens Domnick; Kristine John; Martin Bruschewski; Sven Grundmann The optimal Reynolds-averaged Navier–Stokes (RANS) turbulence model to be used in a Computational Fluid Dynamics (CFD) simulation varies depending on the application. Conventionally, the model is selected from...

... proposed by putting inward/outward guides. The air entrainment and temperature ratios of the new type IRS device have been investigated by solving transport equations (continuity, momentum, energy, and turbulence) using the finite volume solver in ansys fluent . The Reynolds number (Re n ), guide lengths...

...Young Seok Kang; Sangook Jun; Dong-Ho Rhee Large eddy simulations (LESs) on the well-known 7-7-7 fan shaped cooling hole were carried out. Like using a trip strip to create turbulent boundary layer in practical experiments, trip strips with different configurations were placed upstream...

... in the long hot blast main. Also, design of a novel compact mixing chamber is presented and CFD analysis of this mixing chamber is conducted. The new mixing chamber is found to produce almost homogeneously mixed air stream within a very short length due to very high turbulence of the intensely swirling air...

... at the inlet, and the conjugate heat transfer model will be used to correct for this difference. For the numerical model, the realizable k-ɛ turbulent model will be applied with a second order of discretization and an enhanced wall treatment to provide the highest accuracy available. Grid independent studies...

... heat transfer coefficient enhancement ratio decreased from 6 to 3.6 as the flow Reynolds number increased from 210,000 to 840,000. This is attributed to a reduction in the normalized turbulent kinetic energy in the impinging shear layer, which is strongly dependent on the swirl number that remains...

... are scalable to engine conditions. blades channel flow heat transfer rotors turbulence Pin-fins are widely used to cool the trailing edge of gas turbine engine rotor and stator blades (Fig. 1 ). Pin-fins offer significant heat transfer enhancement. They are relatively easy to fabricate...

... of the first stage of vanes and blades of the gas turbine. The study takes place in a three-dimensional model in steady state using FLUENT ® 6.3.26, applying the k-ε turbulence model and chemical equilibrium to the combustion process. The results show the influence of the transition piece geometry over...

... and the CHFs are investigated into details, and the correlations of the subcooled boiling heat transfer and the CHFs for turbulent flow of water in the SUS304-tubes with twisted-tape inserts are given based on the experimental data. The precision or accuracy of a more widely set of correlations in predicting...

... numbers and differing ratios of heated tube length to diameter in laminar, transition, and turbulent forced flow regimes. In this paper, we focus the buoyancy effect on forced convection of single-phase flows in vertical tubes with Reynolds numbers higher than 2000. Using HTRI data and experimental data...

... is more effective in temperature blending for two compressible streams compared with an insert with constant segment length, especially for low-Re-number turbulent flows. 16 07 2010 29 10 2010 22 12 2010 22 12 2010 Rahmani , R. K. , Keith , T. G. , and Ayasoufi...

... featuring a series of two-dimensional grooves. To validate these simulations, micro–particle image velocimetry (PIV) was used to examine the flow field at a turbulent Reynolds number of 5000. The velocity distribution was compared directly to CFD simulations of the same geometry. The flow structures matched...

... fluid dynamics model, including turbulence and heat transfer by all three modes, was created. The model was first validated against the experimental data, also collected as part of this study. Unknown parameters in the model were calibrated to better match the experimental observations. Subsequently...

... 2009 03 12 2009 03 12 2009 cooling heat exchangers jets laminar flow thermal engineering turbulence Impinging jets are a widely used method of achieving high heat transfer coefficients, and are therefore employed in many engineering applications, which include paper drying...

... turbulence High solidity internal cooling arrays are often beneficial in double wall cooling channels, such as the geometry of a vane trailing edge, in reducing temperature gradients and mechanical stress. In this investigation two high solidity (45%) internal cooling geometries, a pin fin array...