The gasification process around the forward stagnation region of a liquid droplet under forced convection is experimentally simulated by impinging a gaseous mixture of oxygen and nitrogen onto a burning pool of ethanol, and numerically analyzed by considering a vaporizing pool in a stagnation-point boundary layer flow. The numerical analysis is accomplished by the finite-volume method incorporated with the SIMPLER algorithm and the power-law scheme. In the experiment, the position of flame and the maximum temperature in the flow field, and the maximum temperature are measured for correlation. The correlation of experimental data and numerical results show that the strength of gasification near the forward stagnation region of a droplet is smaller than that of a whole droplet; and that the dependence on flow convection for combustion and evaporation of liquid pools is exactly the same as that predicted by Frossling for a whole droplet. It is also noted that the gasification process of liquid pool is no longer justified by forced convection as the Reynolds number of the impinging flow is smaller than 7.5 approximately. The fluid mechanics and mixing process of the stagnation-point boundary layer flow are presented from the numerical calculation. Finally, the characteristics of combustion and evaporation for liquid-pool systems show the feasibility of liquid-pool simulation on considering a burning droplet in a reactive and flowing environment in the near future.
|Number of pages||8|
|Journal||Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao|
|Publication status||Published - 1993 Apr 1|
All Science Journal Classification (ASJC) codes
- Mechanical Engineering