Experimental Study on Boiling and Condensation Heat Transfer in a Horizontal Mini Channel

This paper presents experimental results on boiling and condensation heat transfer coefficient in rectangular and rectangular grooved minichannels with hydraulic diameters of 0.81 and 0.64 mm, respectively. The boiling and condensation heat transfer coefficients were measured for saturated condition of R134a flowing in the horizontally placed minichannel tube. Length of the minichannel ube is 852 mm and it was heated or cooled by the water that flows through the upper and lower side of the minichannel tube. Wall temperature was measured by 18 thermocouples embedded in the tube surface