Experimental investigation of non-boiling gas-liquid two phase flow in upward inclined pipes

Experimental study of flow boiling in an inclined mini-channel: Effect of inclination on flow pattern transitions and pressure drops

“…In diabatic configuration, the studies of Bhagwat and Ghajar [7,8] and Mohseni and Akhavan-Behabadi [9] were published more recently. Bhagwat and Ghajar [7,8] presented a study about heated air-water flow pattern transitions in a 12.7 mm inner diameter channel while Mohseni and Akhavan-Behabadi [9] study deals with R134a flow boiling in a 8.9 mm inner diameter channel.…”

“…In diabatic configuration, the studies of Bhagwat and Ghajar [7,8] and Mohseni and Akhavan-Behabadi [9] were published more recently. Bhagwat and Ghajar [7,8] presented a study about heated air-water flow pattern transitions in a 12.7 mm inner diameter channel while Mohseni and Akhavan-Behabadi [9] study deals with R134a flow boiling in a 8.9 mm inner diameter channel. Both studies show a certain agreement with the observations which were previously done in adiabatic configuration with a σ surface tension (N.m -1 ) φ heat flux (W.m -2 ) Φ two-phase flow multiplier (-) pred predicted sat saturation test test top top tot total vap vapour Δp differential pressure taps pronounced effect of inclination on flow patterns for low-inertia flows.…”

“…Bhagwat and Ghajar [7,8] studied the effect of inclination on the pressure drops in heated air-water flows. All these studies show a significant effect of the inclination on the pressure drops for low-inertia two-phase flows.…”

“…It highlights the importance of using transparent evaporator in order to enable a good description of the flow configuration. Void fraction prediction in inclined flowAccording to equations (6),(7) and(8), the calculation of the momentum, gravitational and frictional pressure drops requires the knowledge of the void fraction. Among the several kinds of models of the literature used for the prediction of the void fraction, the drift flux models of Rouhani and Axelsson[23], for vertical flows, and Steiner[24], for horizontal flows are largely employed.…”

The structure of the rising two-phase gas-liquid flow in the natural circulation mode in the inclined passage under the conditions of the significant impact of mass forces

“…Среди бесконтактных оптических методов следует выделить метод цифровой трассерной визуализации, или PIV-метод [9,10]. Одним из важнейших его преимуществ является отсутствие возмущающего влияния на поток [11,12].…”