Measured and predicted frictional pressure drop for boiling zeotropic mixed refrigerants in horizontal tubes

This paper provides experimental data for the frictional pressure drop exhibited by a set of multicomponent zeotropic mixtures boiling in small channels over temperatures ranging from 100 K to room temperature along with the sensitivity of frictional pressure drop to parameters such as mass flux, pressure, tube diameter, and mixture composition. The measured data are compared to several pressure drop correlations available in the literature and the Awad and Muzychka (definition 1) correlation (Awad and Muzychka, 2008) was able to predict the frictional pressure drop over the range of experimental data considered, with an Absolute Average Deviation (AAD) of 17%. The second best correlation is Sun and Mishima (2009) with an AAD of 18%. In addition, the Cicchitti et al. (1959), Müller-Steinhagen and Heck (1986) and Mishima and Hibiki (1996) correlations also show reasonable agreement with the experimental data. Based on our data, the Awad and Muzychka (definition 1) (Awad and Muzychka, 2008) homogeneous model is recommended for prediction of pressure drop because this correlation agrees with 81% of our data with a relative absolute error lower than 25%.