HEAT TRANSFER STUDY ON SUPERCRITICAL CO2 FLOW IN VERTICAL TUBE
36th Annual CNS-CNA Student Conference - 2012 June 12


Presented at:
36th Annual CNS-CNA Student Conference
2012 June 12
Location:
Saskatoon, Canada
Session Title:
CNS/CNA Student Conference 2012

Authors:
Sahil Gupta (UOIT )
Prabu Surendran (UOIT )
Igor Pioro (UOIT )
  

Abstract

This paper presents an analysis of a new heat-transfer correlation developed for supercritical carbon dioxide (CO2) flowing in vertical bare tubes. A large set of supercritical CO2 experimental data was obtained from Chalk River Laboratories (CRL) AECL. Data points were obtained for an upward flow of CO2 inside 8-mm ID vertical Inconel-600 tube with a 2.208-m heated length for a wide range of flow conditions: Pressures ranging from 7.4 to 8.8 MPa, mass fluxes from 900 to 3000 kg/m2s, inlet fluid temperatures from 20 to 40°C, and heat fluxes from 15 to 615 kW/m2; and for several combinations of wall and bulk-fluid temperatures that were below, at, or above the pseudocritical temperature. Extensive literature survey and error analysis of the existing HTC correlations showed that their predicted values can deviate significantly from experimental values, especially within the pseudocritical regions. It also appears that correlations developed for SCW cannot be directly applied to SC CO2. Thus, experimental test matrix for CO2 was used to develop a new preliminary heat-transfer correlation. The uncertainty associated with the correlation is about ±20-30% for HTC values and about ±15-20% for the calculated wall temperature (for the referenced dataset). These errors are significantly lower than previous correlations. However, further error analysis needs to be performed to determine its applicability with other independent datasets.

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