The deterioration of forced convection heat transfer can affect channel flows of supercritical fluids and therefore has to be taken into consideration when dealing with regenerative cooling of liquid rocket engines. A threshold value of the ratio between the heat flux and the specific mass flow rate is identified as the main parameter controlling the heat transfer deterioration onset. The threshold parameter depends on the specific thermodynamic conditions of the coolant and in particular on its pressure level. In the present study, a parametric numerical analysis has been carried out on the flow of supercritical methane in heated channels, for an assigned inlet temperature level and varying the inlet pressure. A correlation for the threshold parameter as a function of pressure is then proposed on the basis of the obtained results.
Onset of Heat Transfer Deterioration in Supercritical Methane Flow Channels / Urbano, Annafederica; Nasuti, Francesco. - In: JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER. - ISSN 0887-8722. - STAMPA. - 27:2(2013), pp. 298-308. (Intervento presentato al convegno 43rd AIAA Thermophysics Conference tenutosi a New Orleans, LA nel JUN 25-28, 2012) [10.2514/1.t4001].
Onset of Heat Transfer Deterioration in Supercritical Methane Flow Channels
URBANO, ANNAFEDERICA;NASUTI, Francesco
2013
Abstract
The deterioration of forced convection heat transfer can affect channel flows of supercritical fluids and therefore has to be taken into consideration when dealing with regenerative cooling of liquid rocket engines. A threshold value of the ratio between the heat flux and the specific mass flow rate is identified as the main parameter controlling the heat transfer deterioration onset. The threshold parameter depends on the specific thermodynamic conditions of the coolant and in particular on its pressure level. In the present study, a parametric numerical analysis has been carried out on the flow of supercritical methane in heated channels, for an assigned inlet temperature level and varying the inlet pressure. A correlation for the threshold parameter as a function of pressure is then proposed on the basis of the obtained results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.