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Keywords: turbulence
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Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. March 2022, 14(3): 031006.
Paper No: TSEA-21-1054
Published Online: June 22, 2021
...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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. February 2022, 14(2): 021004.
Paper No: TSEA-21-1074
Published Online: June 18, 2021
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. September 2011, 3(3): 031011.
Published Online: September 13, 2011
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. September 2011, 3(3): 031010.
Published Online: August 12, 2011
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. June 2011, 3(2): 021007.
Published Online: July 22, 2011
...-turbulent transition occur on each individual pin, at different circumferential locations dependent on the configuration of the pin in an array, as reported by Metzger and Haley [( 1 )]. Studies by Goldstein et al. [( 2 )] and, later, Chyu and Natarajan [( 3 )] showed the heat transfer coefficient...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. June 2011, 3(2): 021003.
Published Online: July 13, 2011
... 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...
Journal Articles
Article Type: Invited Papers
J. Thermal Sci. Eng. Appl. March 2011, 3(1): 012001.
Published Online: March 17, 2011
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. December 2010, 2(4): 041003.
Published Online: January 19, 2011
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. September 2010, 2(3): 031009.
Published Online: December 22, 2010
... 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. For the cases of turbulent flow in this study, the shear-stress transport (SST) version of the k- ω model was selected...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. March 2010, 2(1): 011008.
Published Online: September 23, 2010
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. December 2009, 1(4): 041001.
Published Online: May 17, 2010
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. September 2009, 1(3): 031001.
Published Online: December 3, 2009
... 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...
Journal Articles
Article Type: Research Papers
J. Thermal Sci. Eng. Appl. March 2009, 1(1): 011006.
Published Online: July 21, 2009
... ( Z / D ) of 1.674 diameters. The constant channel height was 0.95 diameters while the converging channel height entered at 0.93 diameters and exited at 0.325 diameters. cooling heat transfer pressure measurement turbulence High solidity internal cooling arrays are often...