NS  Vol.3 No.6 , June 2011
CFD evaluation of thermal convection inside the DACON convection sensor in actual space flight
Abstract: A CFD(Computational Fluid Dynamics) model has been developed using the commercial CFD package FLUENT for the thermal convection inside air filled cylindrical DACON sensor, where the onboard time dependent gravitational micro acceleration has been considered. Time dependent, curve fitted gravitational accelera-tion in x- and y-axes from published data have been incorporated in FLUENT through a User Defined Function (UDF), developed in C which includes space craft rotation. At the sensor plane the two-dimensional flow has also been visualized. A good agreement is between simu-lation and published experimental data. Last but not the least, for checking its response to suffi-ciently strong perturbations in an orbital flight, physical and numerical experiments are carried out where an astronaut swung the sensor in hands along the y axis with amplitude of 10cm and a frequency of 0.2 Hz. A good qualitative validation has been achieved between CFD and actual experimental results.
Cite this paper: Ghosh, P. and Ghosh, M. (2011) CFD evaluation of thermal convection inside the DACON convection sensor in actual space flight. Natural Science, 3, 419-425. doi: 10.4236/ns.2011.36057.

[1]   Bogatyryov, G.P., Putin, G.F., Ermakov, M.K., et al., (1995) A System for analysis and measurement of convection aboard space station: objectives, mathematical and ground-based modeling. 33rd Aerospace Science Meeting and Exhibit, Reno, 1-10.

[2]   Polezhaev, V.I., Ermakov, M.K., Nikitin, N.V., and Nikitin, S.A. (1997) Nonlinear interactions and temperature oscillations in low prandtl melt of czochralski model: validation of computational solutions for gravity-driven and rotatory flows. Proceedings of International Symposium On Advances in Computational Heat Transfer, Cesme, 26-30 May 1997. doi:10.1615/ICHMT.1997.IntSymLiqTwoPhaseFlowTranspPhenCHT.570

[3]   Sazonov, V.V., Komarov, M.M., Polezhaev, V.I., et al., (1997) Microaccelerations on board the mir orbital station and quick analysis of the gravitational sensitivity of convective heat/mass transfer processes. Cosmic Reasearch, 35,

[4]   Yuferev, V.S., Polovko, Y.A., Sazonov, V.V. (1998) Three-dimensional thermal convection caused by spacecraft rotation in a rectangular enclosure with rigid walls. Physics of Fluids, 10, 2517-2524. doi:10.1063/1.869767

[5]   Babushkin, I.A., Bogatyrev, G.P., Glukhov, A.F., et al., (2001) Investigation of Thermal Convection and Low- Frequency Microgravity by the DACON Sensor aboard the Mir Orbital Complex. Cosmic Research, 39, 150-158.

[6]   Bessonov, O.A., Polezhaev, V.I. (2001) Mathematical modeling of convection in the dacon sensor under conditions of real space flight. Cosmic Research, 39, 170-178.

[7]   Ghosh, P., Ghosh, M.K. (2009) Streaming flows in differentially heated square porous cavity under sinusoidal g-jitter, International Journal of Thermal Sciences, 48, 514-520. doi:10.1016/j.ijthermalsci.2008.04.002