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http://dx.doi.org/10.3795/KSME-B.2004.28.11.1289

Direct Numerical Simulation of Strongly-Heated Internal Gas Flows with Large Variations of Fluid Properties  

Bae, Joong-Hun (서울대학교 대학원 기계항공공학부)
Yoo, Jung-Yul (서울대학교 기계항공공학부)
Choi, Hae-Cheon (서울대학교 기계항공공학부 및 난류제어연구단)
You, Jong-Woo (포항산업과학연구원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.11, 2004 , pp. 1289-1301 More about this Journal
Abstract
Direct numerical simulation (DNS) of strongly-heated air flows moving upward in a vertical tube has been conducted to investigate the effect of gas property variations on turbulence modification. Three heating conditions(q$_1$$^{+}$=0.0045, 0.0035 and 0.0018) are selected to reflect the experiment of Shehata and McEligot (1998) at the inlet bulk Reynolds numbers of 4300 and 6000. At these conditions, the flow inside the heated tube remains turbululent or undergoes a transition to subturbulent or laminarizing flow. Consequently, a significant impairment of heat transfer occurs due to the reduction of flow turbulence. The predictions of integral parameters and mean profiles such as velocity and temperature distributions are in excellent agreement with the experiment. The computed turbulence data indicate that a reduction of flow turbulence occurs mainly due to strong flow acceleration effects for strongly-heated internal gas flows. Thus, buoyancy influences are secondary but not negligible especially for turbulent flow at low heating condition. Digital flow visualization also shows that vortical structures rapidly decay as the heating increases.s.
Keywords
DNS; Property Variation; Turbulence Modification; Heat Transfer Impairment; Flow Acceleration; Buoyancy Influences;
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1 Shehata, A. M. and McEligot, D. M., 1995, 'Turbulence Structure in the Viscous Layer of Strongly Heated Gas Flows,' Tech. Report INEL-95/0223, Idaho National Engineering Laboratory
2 Pierce, C. D., 2001, 'Progress-Variable Approach for Large-Eddy Simulation of Turbulent Combustion,' Ph. D. Thesis, Stanford University
3 Kline, S. J., Reynolds, W. C., Schraub, F. A. and Rundstadler, P. W., 1967, 'The Structure of Turbulent Boundary Layers,' J. Fluid Mech, Vol. 30, pp. 741~773   DOI
4 Ezato, K., Shehata, A. M., Kunugi, T. and McEligot, D. M., 1999, 'Numerical Predictions of Transitional Features of Turbulent Gas Flows in Circular Tubes with Strong Heating,' ASME J. Heat Transfer, Vol. 121, pp. 546-555   DOI
5 Mikielewicz, D. P., 1994, 'Comparative Studies of Turbulence Models Under Conditions of Mixed Convection with Variable Properties in Heated Vertical Tubes,' Ph. D. Thesis, University of Manchester
6 McEligot, D. M., 1986, 'Convective Heat Transfer in Internal Gas Flows with Temperature-Dependent Properties,' Adv. Transport Processes, Vol. 4, pp. 113-200
7 Narasimha, R. and Sreenivasan, K. R., 1979, 'Relaminarization of Fluid Flows,' Adv. Applied Mech. Vol. 19,pp.221-309   DOI
8 Eggels, J. G. M., Unger, F., Weiss, M. H., Westerweel, J., Adrian, R. J., Friedrich, R. and Nieuwstadt, F. T. M., 1994, 'Fully Developed Turbulent Pipe Flow: A Comparison Between Direct Numerical Simulation and Experiment,' J. Fluid Mech. Vol. 268, pp. 175-209   DOI   ScienceOn
9 Chambers, F. W., Murphy, H. D. and McEligot, D. M., 1983, 'Laterally Converging Flow. II. Temporal Wall Shear Stress,' J. Fluid Mech. Vol. 127, pp. 403-428   DOI   ScienceOn
10 Mikielewicz, D. P., Shehata, A. M., Jackson, J. D. and McEligot, D. M., 2002, 'Temperature, Velocity and Mean Turbulence Structure in Strongly Heated Internal Gas Flows. Comparison of Numerical Predictions with Data,' Int. J. Heat Mass Transfer, Vol. 45, pp. 4333-4352   DOI   ScienceOn
11 Torii, S. and Yang, W. J., 1997, 'Laminarization of Turbulent Gas Flow inside a Strongly Heated Tube,' Int. J. Heat Mass Transfer, Vol. 40, pp. 3105-3117   DOI   ScienceOn
12 Bankston, C. A. and McEligot, D. M., 1970, 'Turbulent and Laminar Heat Transfer to Gases with Varying Properties in the Entry Region of Circular Ducts,' Int. J. Heat Mass Transfer, Vol. 13, pp. 319-344   DOI   ScienceOn
13 Satake, S., Kunugi, T., Shehata, A. M. and McEligot, D. M., 2000, 'Direct Numerical Simulation for Laminarization of Turbulent Forced Gas Flows in Circular Tubes with Strong Heating,' Int. J. Heat Fluid Flow, Vol. 21, pp. 526-534   DOI   ScienceOn
14 Perkins, K. R. and McEligot, D. M., 1975, 'Mean Temperature Profiles in Heated Laminarizing Air Flows,' ASME J. Heat Transfer, Vol. 97, pp. 589-59   DOI
15 Shehata, A. M. and McEligot, D. M., 1998, 'Mean Turbulence Structure in the Viscous Layer of StronglyHeated Internal Gas Flows. Measurement,' Int. J. Heat Mass Transfer, Vol. 41, pp. 4297-4313