アンモニア/水混合媒体のプール沸騰熱伝達の促進 : 界面活性剤の効果(熱工学,内燃機関,動力など)

概要

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Nucleate boiling heat transfer coefficients of ammonia/water mixtures have been measured when a surface-active agent was added into the mixtures. The experiment has been carried out on a horizontal heated fine wire at pressure of 0.4MPa. The effect of the concentration of the ammonia and the surface-active agent on the coefficients was experimentally clarified in the ammonia fraction of C=0.3 and 0.7 and in the surfactant concentration of C_s=0-3500ppm. As a result, the coefficients were enhanced in lower ammonia fraction, C=0.3 and in low heat flux, which is just after onset of boiling. It was also found that the enhancement effect by the surface-active agent disappeared in surfactant concentration over 1000ppm in C=0.3. It is also shown that the heat of mixing generated near vapor-liquid interface can be easily removed and pressure and temperature in the system can be easily controlled by placing a cooling pipe on vapor-liquid interface and that measurement accuracy of the heat transfer coefficients is improved. We correlated using the improved measurement data in the current paper.
2010-02-25