Gasification of Silicone Fluids Under External Thermal Radiation part Ⅰ. Gasification Rate and Global Heat of Gasification

摘要

Transient gasification rates and fluid temperatures were measured for polydimethylsiloxane fluids ranging in viscosity form 0.65 cS to 60 000 cS in a nitrogen atmosphere at external radiant fluxes form 20 kW/m~2 to 70 kW/m~2. A detailed energy balance for each fluid sample was conducted to determine its global heat of vaporization. Two major energy loss corrections were identified and quantified. The absorption of incident radiation by the volatile by the volatile products form short chain oligomers was measured and found to substantially reduce the incident flux to the sample surface; the energy loss due to re-radiation was determined to be a substantial factor in reducing the net heat flux to the sample for long chain length fluids.