01501nas a2200193   4500008004100000245005900041210005900100260019200159520069300351653001701044653002101061653001801082653002601100100003001126700002301156700002201179700001301201856009301214       2015                        eng d00aTwo phase flow boiling pressure drop in small channels0 aTwo phase flow boiling pressure drop in small channels  aSARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbIUTAM, Dept Sci Technol India; Ministry Earth Sciences; CSIR; Natl Sci Fdn, USA; Intel Ansys Fujitsu & TSI IndiacDEC3 a<p>Two-phase pressure drop, flow instability and boiling regime identifications are an essential step in the design of a variety of plant in the power and process industries. Despite the wide spread applications, significant experimental data on flow boiling in small channel is not available. In the present work, experimental set-up was designed for studying boiling flows in 19 mm ID tube and identifies flow regimes at various mass and heat flux conditions by varying inlet fluid temperature. The steady-state pressure data was collected and flow regimes identified using pressure drop and pressure fluctuations inside the channel. (C) 2015 The Authors. Published by Elsevier B.V.</p>10aflow boiling10aflow instability10apressure drop10aregime identification1 aSardeshpande, Madhavi, V.1 aShastri, Parikshit1 aRanade, Vivek, V.1 aSahu, KC  uhttps://library.ncl.res.in/content/two-phase-flow-boiling-pressure-drop-small-channels-002133nas a2200157   4500008004100000245005900041210005800100260000800158300001200166490000700178520162400185100003001809700002301839700002201862856009101884       2016                        eng d00aTwo-phase flow boiling pressure drop in small channels0 aTwophase flow boiling pressure drop in small channels  cOCT  a636-6490 v613 aTwo-phase flow boiling in small channels finds a variety of applications in power and process industries. Heat transfer, boiling flow regimes, flow instabilities, pressure drop and dry out are some of the key issues related to two-phase flow boiling in channels. In this work, the focus is on pressure drop in two-phase flow boiling in tubes of 19 mm diameter. These tubes are typically used in steam generators. Relatively limited experimental database is available on 19 mm ID tube. Therefore, in the present work, the experimental set-up is designed for studying flow boiling in 19 mm ID tube in such a way that any of the different flow regimes occurring in a steam generator tube (from pre-heating of sub-cooled water to dry-out) can be investigated by varying inlet conditions. The reported results cover a reasonable range of heat and mass flux conditions such as 9-27 kW/m(2) and 2.9-5.9 kg/m(2) s respectively. In this paper, various existing correlations are assessed against experimental data for the pressure drop in a single, vertical channel during flow boiling of water at near-atmospheric pressure. A special feature of these experiments is that time-dependent pressures are measured at four locations along the channel. The steady-state pressure drop is estimated and the identification of boiling flow regimes is done with transient characteristics using time series analysis. Experimental data and corresponding results are compared with the reported correlations. The results will be useful for understanding key aspects of flow boiling in small channels. (C) 2016 Elsevier Inc. All rights reserved.1 aSardeshpande, Madhavi, V.1 aShastri, Parikshit1 aRanade, Vivek, V.  uhttps://library.ncl.res.in/content/two-phase-flow-boiling-pressure-drop-small-channels