Plain copper horizontal cylindrical heater
of 28.5 mm O.D. and length of 90 mm.
Park and Jung [29] CNTs-R123 and CNTs-R134a,
1 vol.% of CNTs
Plain stainless steel horizontal circular tube
of 19 mm O.D. and length of 152 mm.
CNTs increased boiling heat transfer coefficients, the enhancement
was up to 36.6%.
the nanoparticle concentration.