An improved version of the generalized correlation of critical heat flux for the forced convective boiling in uniformly heated vertical tubes

Experimental investigation of dryout of propane in uniformly heated single vertical mini-channels

“…The results showed increase in CHF with mass flux and no effect of subcooling was observed on CHF. comparison of experimental data with well known correlations showed that Katto and Ohno [5] correlation predicted the data with MAD (Mean Absolute Deviation) of 32.8%. Based on this correlation, a new correlation was suggested which predicted their experimental data with a MAD of 7.6%.…”

“…It was found that the saturation temperature has small effect on the dryout heat flux for all working fluids while dryout heat flux was observed to increase with increase in mass flux. Among tested CHF correlations, the Katto and Ohno [5] correlation predicted their experimental results well, with a MAD of 6.7%.…”

“…The vapour to liquid density ratio is directly proportional to saturation temperature and the latent heat of vapourization is inversly proportional to saturation temperature. In famous Katto and Ohno [5] correlation, vapour to liquid density ratio and latent heat of vapourization are also in linear relationship with critical heat flux. The increase in vapour to liquid density with saturation temperature tends to reduce the droplet entrainment rate in the vapour core which may increase the dryout heat flux [6].…”

“…Different forms of the correlation according to experimental conditions and geometry can be seen in [5]. Shah [13] developed a correlation on the basis of 23 fluids in vertical uniformly heated conventional tubes.…”

“…In this section, an effort has been made to compare our experimental data of complete dryout with well known verified predicting methods for macro channels which have been used for decades, like the correlations by Katto and Ohno [5], Bowring [7], and Shah [13], to see their applicability in minichannels. The experimental data is also compared with predicting methods which are developed specifically for mini and microchannels like Callizo et al [10], Bowers and Mudawar [9], Qi et al [11], Zhang et al [14] and Wojtan et al [4].…”