TY - GEN
T1 - Two-phase flow regime identification through local temperature mapping
AU - O'Donovan, Alan
AU - Grimes, Ronan
N1 - Publisher Copyright:
© 2017 Begell House Inc.. All rights reserved.
PY - 2017
Y1 - 2017
N2 - Two-phase flows underpin some of our most ubiquitous technologies, ranging from micro-scale liquid-liquid electronics cooling to macro-scale liquid-vapour condensation in Rankine cycle thermoelectric power plants. Establishing the morphology of a two-phase flow, under a prescribed set of conditions, is considered particularly important. As the pressure loss and heat transfer characteristics of a two-phase flow are intimately linked to the fluidic arrangement, knowledge of the prevailing flow topology enhances understanding, and can lead to the development of flow-specific correlations and/or models. This paper presents a novel, non-invasive experimental measurement technique for identifying the predominant flow regime of a diabatic flow in a horizontal, circular tube. Specifically, this paper focuses on condensing flows of steam, at typical Rankine cycle conditions. However, it is proposed that the arrangement and methodology can be applied to other diabatic cases. The suggested approach employs a temperature measurement platform, from in-situ instrumentation, to determine the temperature difference associated with the presence of a liquid film inside the tube. Through analysis and interpretation of local temperature difference measurements around the inside tube circumference, and along the tube length, the flow regime can be identified. For the case examined in this paper, the flow regime was seen to transition from an annular-type profile nearest the tube inlet to a stratified-wavy topology towards the tube exit.
AB - Two-phase flows underpin some of our most ubiquitous technologies, ranging from micro-scale liquid-liquid electronics cooling to macro-scale liquid-vapour condensation in Rankine cycle thermoelectric power plants. Establishing the morphology of a two-phase flow, under a prescribed set of conditions, is considered particularly important. As the pressure loss and heat transfer characteristics of a two-phase flow are intimately linked to the fluidic arrangement, knowledge of the prevailing flow topology enhances understanding, and can lead to the development of flow-specific correlations and/or models. This paper presents a novel, non-invasive experimental measurement technique for identifying the predominant flow regime of a diabatic flow in a horizontal, circular tube. Specifically, this paper focuses on condensing flows of steam, at typical Rankine cycle conditions. However, it is proposed that the arrangement and methodology can be applied to other diabatic cases. The suggested approach employs a temperature measurement platform, from in-situ instrumentation, to determine the temperature difference associated with the presence of a liquid film inside the tube. Through analysis and interpretation of local temperature difference measurements around the inside tube circumference, and along the tube length, the flow regime can be identified. For the case examined in this paper, the flow regime was seen to transition from an annular-type profile nearest the tube inlet to a stratified-wavy topology towards the tube exit.
KW - Condensation
KW - Flow mapping
KW - Flow regime
KW - Horizontal tube
KW - Instrumentation
KW - Two-phase flow
UR - http://www.scopus.com/inward/record.url?scp=85181550165&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85181550165
T3 - Proceedings of the Thermal and Fluids Engineering Summer Conference
SP - 1349
EP - 1360
BT - Proceedings of the 2nd Thermal and Fluid Engineering Summer Conference, TFESC 2017 and 4th International Workshop on Heat Transfer, IWHT 2017
PB - Begell House Inc.
T2 - 2nd Thermal and Fluid Engineering Summer Conference, TFESC 2017 and 4th International Workshop on Heat Transfer, IWHT 2017
Y2 - 2 April 2017 through 5 April 2017
ER -