Modeling of Radiation above Io’s Surface from Pele-type Volcanic Plumes and Under- Ground from the Conduit Wall
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چکیده
Introduction: Radiation associated with Io’s Pele-type volcanic plumes is studied numerically. Infrared (IR) radiation from three SO vibrational bands ( , and ) in the plume has been examined previously [1] using an optically thin gas model within DSMC [2]. In the present work, the model is improved such that opacity at the band centers is accounted for; it is found that the plume gas dynamics is appreciably altered. Related thermal issues in the underground conduit that leads to the plume are also investigated. We examine if the gas flow in the conduit is adiabatic or if radiative heating from the wall makes it more nearly isothermal. Model: The flow conditions and geometry used in the conduit study are shown in Fig. 1. The conduit is assumed to be converging-diverging in shape. The exit velocity, temperature and number density are set to be consistent with the vent parameter fits in [1] for Pele-type plumes. The average radius is allowed to vary and the size sensitivity of the results is examined. The wall temperature of the conduit is varied parametrically. The length of the conduit is assumed to be 10 km. A dimensionless ratio, A , is defined as the radiative heat flux of the conduit wall into the gas divided by the total energy flux: !
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تاریخ انتشار 2003