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首页> 外文期刊>The Journal of Chemical Thermodynamics >Speed of sound in (0.4C_2H_6 + 0.6CO_2) at temperatures between T = 220 K and T = 450 K and pressures up to p = 1.2 MPa
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Speed of sound in (0.4C_2H_6 + 0.6CO_2) at temperatures between T = 220 K and T = 450 K and pressures up to p = 1.2 MPa

机译:在T = 220 K和T = 450 K之间且压力高达p = 1.2 MPa时(0.4C_2H_6 + 0.6CO_2)的声速

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摘要

The speed of sound u has been measured in {(1 - x_2)C_2H_6+x_2CO_2}, with x2 approximately equals 0.6, along seven isotherms at temperatures between T = 220 K and T = 450 K by means of a spherical resonator. The greatest pressure on each isotherm was approximately p = 1.2 MPa except at T = 220 K where, to avoid condensation, it was restricted to p = 0.6 MPa. Corrections to the speed of sound for the effects of vibrational relaxation have been calculated from a two-mode model containing relaxation times that were fitted to the excess sound absorption in the mixture and in both pure components. The corrected speeds of sound have a precision better than ±1.10~(-5)·u and an estimated overall uncertainty of ±1.10~(-4)·u. The precise composition of the sample used on each isotherm was determined from the experimental speeds of sound extrapolated to the limit of zero pressure. Second and third acoustic virial coefficients of the mixture and ordinary interaction second virial coefficients are reported.
机译:已经通过球形谐振器在{=(1-x_2)C_2H_6 + x_2CO_2}中测量了声音的速度,沿着温度在T = 220 K和T = 450 K之间的七个等温线,x2等于0.6。等温线上的最大压力约为p = 1.2 MPa,除了在T = 220 K处,为了避免冷凝,将其限制在p = 0.6 MPa。已从包含放松时间的双模模型计算出了对振动弛豫影响的声速校正,该模型适合混合物和两种纯组分中过量的吸声。校正后的声速精度优于±1.10〜(-5)·u,总体不确定度估计为±1.10〜(-4)·u。根据外推至零压力极限的声音实验速度,确定每次等温线使用的样品的精确成分。报告了混合物的第二和第三声维里系数和普通相互作用的第二维里系数。

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