Experiments and updated model for two phase frictional pressure drop inside minichannels

Condensing two-phase pressure drop and heat transfer coefficient of propane in a horizontal multiport mini-channel tube: Experimental measurements

“…Frictional pressure gradient was correctly predicted by Friedel (1979) andDel Col et al (2013). Condensation heat transfer was best predicted by Cavallini et al (2006) and Moser et al (1998) extended to the minichannel geometry using Zhang and Webb (2001) correlation for the two-phase frictional pressure drop.…”

“…The design of high performance mini-channel condensers requires accurate predictive tools for both pressure drop and condensation heat transfer coefficient. For this reason, there are many international researchers working in two-phase flow heat transfer and pressure drop characterisation during condensation and boiling in mini-channels, such as Del Col et al (2010Col et al ( , 2013, Bandhauer et al (2006), Agarwal and Garimella (2008), Agarwal et al (2010) or Park et al (2011), Keepaiboon et al (2015), Markal et al (2016), Goss et al (2015), Goss and Passos (2013), Khovalyg et al (2015), Lee and Mudawar (2016) or Mori (2016) between others.…”

Two-phase pressure drop and condensation heat transfer of R32/R1234ze(E) non-azeotropic mixtures inside a single microchannel

“…Different models have been implemented to get the pressure profile. The Del Col et al (2013) model is used for the frictional pressure gradient, the Paliwoda (1992) equation is used when a sudden change in the geometry occurs under twophase flow conditions, the Idelchik (1996) correlation is used for a sudden contraction when subcooled refrigerant exits the measuring sector, and the Cavallini et al (2009) model is used for the pressure recovery due to the momentum. Then the total calculated pressure drop is matched to the measured value by using a multiplying factor.…”

“…In the present work, the model by Cavallini et al (2006), corrected for mixtures, is used for the prediction of the heat transfer coefficient, and the model by Del Col et al (2013) is used for the pressure drop. The accuracy of these models in the case of this mixture has been proven in previous sections.…”

Effect of Liquid Reynolds Number on Pressure Drop of Evaporative R-290 in 500µm Circular Tube

“…(Del Col et al, 2014) research two-phase heat transfers and pressure drops of R-290 in a minichannel with an internal diameter of 0.96 mm and a rough inner surface. The predictions for these pressure drops used separate models, namely Friedel (1979), Del Col et al (2013, Zhang and Webb (2001).…”