Temperature gradient curves are given for 0.5--2 kbar and 300--600℃ based on internal temperature measurements, and an empirical formula tx=T+(α0+α1T+α2T^2+α3T^3+α4T^4+α4TP+α5P)x is established to calculate th...Temperature gradient curves are given for 0.5--2 kbar and 300--600℃ based on internal temperature measurements, and an empirical formula tx=T+(α0+α1T+α2T^2+α3T^3+α4T^4+α4TP+α5P)x is established to calculate the temperature at any.point,x,xwithin the bomb.Uncertainty of 90 percent estimates by using this formula is less than 5 degrees. In most instances, real pressure within the bomb is only 60 to 80 percent of the designed pressure as based on P-V-T relations due to the exlstance of temperature gradient. This large pressure departure can be reduced to less than 30 bars by using t^-=11.6+0.8973T+(0.01-3.06·10^-5T-5.664·10^-8t2+8.8667·10^11T^3)(P-1250)on the assumption of uniform temperature within the vessel. All temperature-dependent properties such as water fugacity, ionization constant,and the solubility of gas in fluid phase will vary with this temperature gradient. On the other hand, because the pressure within the bomb keeps uniform, there must be an opposite gradient with respect to water density. Tberefore. variations will likewise be expected in all the properties which are a function of water density, such as the dielectric constant and activity coefficient, These variations may be important for the interpretation and understanding of some experimental results.展开更多
文摘Temperature gradient curves are given for 0.5--2 kbar and 300--600℃ based on internal temperature measurements, and an empirical formula tx=T+(α0+α1T+α2T^2+α3T^3+α4T^4+α4TP+α5P)x is established to calculate the temperature at any.point,x,xwithin the bomb.Uncertainty of 90 percent estimates by using this formula is less than 5 degrees. In most instances, real pressure within the bomb is only 60 to 80 percent of the designed pressure as based on P-V-T relations due to the exlstance of temperature gradient. This large pressure departure can be reduced to less than 30 bars by using t^-=11.6+0.8973T+(0.01-3.06·10^-5T-5.664·10^-8t2+8.8667·10^11T^3)(P-1250)on the assumption of uniform temperature within the vessel. All temperature-dependent properties such as water fugacity, ionization constant,and the solubility of gas in fluid phase will vary with this temperature gradient. On the other hand, because the pressure within the bomb keeps uniform, there must be an opposite gradient with respect to water density. Tberefore. variations will likewise be expected in all the properties which are a function of water density, such as the dielectric constant and activity coefficient, These variations may be important for the interpretation and understanding of some experimental results.
