Validation of the HAM-Based Solution (Eq. (26) with Eq. (32)): (a) with numerical solution (the 4th order RK method) (A = 0.202, α = −0.078, a/h = −0.043, Ca/h = 0.0106, nH = 2.562, h = −0.618) and (b) with Run S6 of Einstein and Chien[54] data.