0.9 The steady-state gas concentration in spherical coordinates may be written for radially symmetric flow as...
0.9 The steady-state gas concentration in spherical coordinates may be written for radially symmetric flow as 1 d r2 de (rJg) + g = 0 where Jg is the gas flux in the radial direction and the gas consumption rate. (a) For the special case of constant gas consumption rate, calculate the gas flux Jg() inside a spherical aggregate of radius r. Assume that the flux vanishes at r = 0. (5 marks) (b) Using the gas flux equation to calculate the gas concentration Co(r) inside the aggregate assuming that it remains at the constant value Cy(R) = Co atr = R. js = _De Cocina where Ds is gas diffusivity in soil and Cg is the concentration of gas. (5 marks)