A_w	the heat transfer area
A_b	the area of the bottom surface
C_p	specific heat capacity
D_h	the hydraulic diameter
f	friction coefficient
h	heat transfer coefficient
M	the mass flow
Nu	Nusselt number
P	pressure in the flow field
Δp	pressure drop
q	the wall heat flux
Q	the total heat
R_th	total thermal resistance
Re	Reynolds number
T	temperature
T_”in”	the inlet temperature
T_s	the temperature of solid region
T_max	the maximum substrate temperature
ΔT_m	the mean temperature difference
V	the inlet velocity
u_i	velocity components in direction i
u_j	velocity components in direction j
x_i	cartesian coordinate components
x_j	cartesian coordinate components
ρ	density
λ_f	thermal conductivity of liquid region
λ_s	the thermal conductivity of the solid region
μ_f	Dynamic viscosity of base fluid