Some Aspects of LMMHD Two-Phase Flow: MHD Generator Configuration

The influence of an external magnetic field on LMMHD two-phase flows in vertical rectangular ducts has been examined. The goal of the work is the construction of models being able to predict the average behaviour of the flow as well as being relatively easy to survey and to handle. Results regarding the slip ratio obtained from a bubbly flow model are compared with experimental data got from measurements at the mercury-air facility. In the case of an applied magnetic field discrepancies between model and experiment are obtained giving an indication of the imperfection of the present state of the model. The crucial point is the validation of the semiempirical closure laws involved in the LMMHD tow-phase flow models. In the present state of the experiments the influence of the void fraction on the apparent electrical conductivity of the two-phase flow has been investigated. The results obtained from the mercury-air facility of LEGI-IMG are located between the relations given by Maxwell and Petric & Lee, respectively.