Critical Review of Correlations for Predicting Two-Phase Flow Pressure Drop across Tube Banks

Two-phase pressure drop during upward cross flow in triangular tube bundle

“…8, none of the methodologies is capable of predicting the experimental trend of the pressure drop with varying the superficial gas velocity for the lower liquid superficial velocity. In fact, most of the methods under predict the experimental data, except by Ishihara et al [17] trends according to Fig. 9.…”

“…Moreover, it is surprising that Diehl [14] provides good predictions of the experimental results, since this method was developed based on experimental data for vertical downward flow. According to the methods proposed by Dowlati et al [15], Schrage et al [11], Ishihara et al [17] and Xu et al [13] the pressure drop varies with the gas superficial velocity within a narrow range. It must be mentioned that these methods were developed based on the methodology proposed by Chisholm [19] for intube two-phase flow, which in turn takes the Martinelli parameter as the main variable for the determination of two-phase multiplier.…”

“…Grant and Chisholm [16] Ishihara et al [17] Schrage et al [11] Xu et al [13] Homogeneous model Dowlati et al [15] Grant and Chisholm [16] Ishihara et al [17] Schrage et al [11] Experimental results for pressure drop during twophase flow were presented. For reduced liquid superficial velocities, the total pressure drop decreases with increasing the superficial gas velocity, due to the reduction of the gravitational pressure drop parcel.…”

Estudo teórico e experimental sobre padrões de escoamento, fração de vazio e perda de pressão durante escoamento bifásico água-ar cruzado ascendente externo a banco de tubos

“…( 3.4 ), e X tt é o parâmetro de Martinelli, definido através da seguinte relação: Capítulo 5 e Apêndice B. Ishihara et al (1980) indicam que a adoção do expoente do número de Reynolds igual a -0,2 implica em menores desvios entre as estimativas e os resultados experimentais, no entanto eles ressaltam a inexistência de uma justificativa plausível para este resultado.…”

“…Conforme indicado por Ishihara et al (1980), esse foi o primeiro método proposto para previsão da parcela friccional da perda de pressão durante escoamentos bifásicos externos a banco de tubos.…”