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

Table 2

Top channel (cold fluid) (Hh + t ≤ y ≤ Hh + t + Hc).

Location	Boundary condition	Comments
At x = 0		Cold fluid outflow (fully developed flow, end of the channel
At x = L	uc = uci,  =  = 0, Tc = Tci	Cold fluid inflow
At y = Hh + t	uc =  =  = 0, Tc = Ts	Fluid-solid interface (no-slip, conjugate heat transfer)
At y = Hh + t + Hc	uc =  =  = 0	No-slip, adiabatic wall
At z = 0	uc =  =  = 0	No-slip, adiabatic wall
At z = Wch	uc =  =  = 0	No-slip, adiabatic wall