What is "concentration susceptibility"? -- CFD Online Discussion Forums

October 23, 2016, 08:28	What is "concentration susceptibility"?	#1
qwebean New Member qwebean Join Date: Aug 2016 Posts: 1 Rep Power: 0	Hello everyone, This phrase makes me confused when I read papers on Soret and Dufour effect. $u\frac{{\partial T}}{{\partial x}} + v\frac{{\partial T}}{{\partial y}} = \frac{k}{{\rho {c_p}}}\frac{{{\partial ^2}T}}{{\partial y}} + \frac{{{D_m}{k_T}}}{{{C_s}{c_p}}}\frac{{{\partial ^2}C}}{{\partial {y^2}}}$ where is concentration susceptibility. is mass diffusivity, is specific heat at constant pressure, is thermal diffusion ratio. $C,C_{\infty} ,C_w$ is concentration. it is also used to calculate Dufour number: ${D_f} = \frac{{{D_m}{k_T}({C_w} - {C_\infty })}}{{{C_s}{c_p}{\alpha _m}({T_w} - {T_\infty })}}$ ${\alpha _m} = \frac{k}{{\rho {c_p}}}$ But how to define "concentration susceptibility"?I used Google search and did not get what I need. Since I am not an English native speaker, I just can not understand what "susceptibility" means here. Thanks.

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