TY - GEN
T1 - Experiments in cap-bubbly two-phase flows for two-group IATE development
AU - Worosz, T.
AU - Kim, S.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - In the two-group interfacial area transport equation (IATE) used to calculate the interfacial area concentration, ai bubbles are categorized into two groups. Namely, group-I consists of spherical/distorted bubbles, and group-II consists of cap/slug/churn-turbulent bubbles. Robust models for the major bubble interaction mechanisms that cause the transition from purely onegroup to two-group flows are essential to the dynamic closure of the two-fluid model with the two-group IATE. Therefore, the present study seeks to establish an experimental database in capbubbly flows that highlights this transition to support model development. A four-sensor conductivity probe is used to obtain measurements of local time-averaged two-phase flow parameters, including the void fraction and ai in vertical-upward air-water two-phase flow in a 5.08cm pipe. Four flow conditions are investigated at =2m/s with increasing g> to study the generation and growth of group-II bubbles. Characteristic features of the local void fraction and ai distributions are discussed. Additionally, axial development of area-averaged void fraction and ai that is indicative of exchange between the bubble groups is presented.
AB - In the two-group interfacial area transport equation (IATE) used to calculate the interfacial area concentration, ai bubbles are categorized into two groups. Namely, group-I consists of spherical/distorted bubbles, and group-II consists of cap/slug/churn-turbulent bubbles. Robust models for the major bubble interaction mechanisms that cause the transition from purely onegroup to two-group flows are essential to the dynamic closure of the two-fluid model with the two-group IATE. Therefore, the present study seeks to establish an experimental database in capbubbly flows that highlights this transition to support model development. A four-sensor conductivity probe is used to obtain measurements of local time-averaged two-phase flow parameters, including the void fraction and ai in vertical-upward air-water two-phase flow in a 5.08cm pipe. Four flow conditions are investigated at =2m/s with increasing g> to study the generation and growth of group-II bubbles. Characteristic features of the local void fraction and ai distributions are discussed. Additionally, axial development of area-averaged void fraction and ai that is indicative of exchange between the bubble groups is presented.
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M3 - Conference contribution
AN - SCOPUS:84908258293
T3 - Embedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
SP - 302
EP - 314
BT - Embedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
PB - American Nuclear Society
T2 - Embedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
Y2 - 15 June 2014 through 19 June 2014
ER -