Investigation of Counterflow Microchannel Heat Exchanger with Hybrid Nanoparticles and PCM Suspension as a Coolant

Table 1

Bottom channel (hot fluid) (0 ≤ y ≤ Hh).

Location	Boundary condition	Comments
At x = 0	uh = uhi,  =  = 0, Th = Thi	Hot fluid inflow
At x = L		Hot fluid outflow (fully developed flow, end of the channel)
At y = 0	uh =  =  = 0	No-slip, adiabatic wall
At y = Hh	uh =  =  = 0, Th = Ts	Fluid-solid interface (no-slip, conjugate heat transfer)
At z = 0	uh =  =  = 0	No-slip, adiabatic wall
At z = Wch	uh =  =  = 0	No-slip, adiabatic wall