Convective Heat Transfer from In-Tube Flow of Turbulent Supercritical Carbon Dioxide: Part 1—Numerical Analysis

Pitla, Srinivas S.; Groll, Eckhard A.; Ramadhyani, S.

doi:10.1080/10789669.2001.10391280

Cited by 34 publications

(5 citation statements)

References 13 publications

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“…In the early days, the researchers developed in-house code to solve the SCO 2 heat transfer problem in simple geometries. Pitla et al [63] proposed a mathematical model based on the Favre-averaged, parabolized Navier-Stokes equations in conjunction with Nikuradse's mixing length model and the k equation turbulence model to simulate the turbulent flow of SCO 2 during in-tube cooling. It was seen that the velocity and temperature laws of the wall for constant property flows were not valid here.…”

Section: In-house Codesmentioning

confidence: 99%

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

Wei

Tian

et al. 2022

Energies

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Supercritical carbon dioxide (SCO2) is widely used in many fields of energy and power engineering, such as nuclear reactors, solar thermal power generation systems, and refrigeration systems. In practical applications, SCO2 undergoes a cooling process significantly when it is cooled near the pseudo−critical point. Because of the drastic variations in thermo−physical properties, the heat transfer characteristics fluctuate, affecting the heat exchange and overall cycle performance. This paper summarizes extensive experiments and numerical simulations on the cooling process of SCO2 in various application scenarios. The effects of various working conditions, such as mass flow, working pressure, pipe diameter, flow direction, and channel shapes, are reviewed. The applicability and computational results using different numerical methods under different working conditions are also summarized. Furthermore, empirical correlations obtained in experiments at different conditions are included. The present review can provide a helpful guideline for the design of effective cooling systems or condensers so that the accuracy of the design and efficiency of the system can be improved.

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Section: In-house Codesmentioning

confidence: 99%

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

Wei

Tian

et al. 2022

Energies

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“…The heat transfer in supercritical CO2 has been investigated for various temperatures, pressures, tube diameters, heat fluxes, mass fluxes and buoyancy forces. One of the most important heat transfer characteristics of supercritical CO2 is the peak heat transfer coefficient near the pseudo-critical point which decreases with increasing pressure (Pitla et al, 2001a;Pitla et al, 2001b;Liao and Zhao, 2002a;Yoon et al, 2003). The heat transfer rate increases with decreasing tube diameter for 1-7.75 mm tubes (Oh and Son, 2010;Dang and Hihara, 2004).…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Heat Transfer in a Supercritical Co2/Dme Mixture Flowing in Cooled Helically Coiled Tubes

Ba¹,

Chen²,

Li³

2021

Frontiers in Heat and Mass Transfer

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The heat transfer of supercritical CO2/DME mixtures was modeled in this study for a mass ratio of 95/5 for cooling in horizontal helically coiled tubes. The CO2/DME heat transfer coefficient was higher in the high-temperature zone than with pure CO2. The heat transfer of CO2/DME (95/5) was predicted for various mass fluxes, heat fluxes and pressures. The CO2/DME heat transfer coefficient increased with the mass flux due to the increased turbulent diffusion, and first increased but then decreased with the heat flux. The peak heat transfer coefficient of CO2/DME shifted toward the high-temperature region as the operating pressure increased. The effects of buoyancy and the centrifugal force were also analyzed to better understand the heat transfer mechanisms in helically coiled tubes. The gravitational buoyancy effect on the heat transfer decreased with mass flux while increased with heat flux. Higher heat fluxes strengthened the centrifugal buoyancy effect on the heat transfer at the beginning of the cooling process but weakened the centrifugal buoyancy effect later in the cooling process. The present study gives insight into the flow and heat transfer processes in helically coiled tubes which is useful for heat exchanger designs and refrigerant selection.

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“…They compared the above correlation with their own experimental results and the results of Tanaka et al (1971) and found satisfactory agreement. More recently, Pitla et al (2001b;2001a) conducted a combined experimental and numerical study of the heat transfer and pressure drop of in-tube cooling of carbon dioxide.…”

Section: Prior Investigations Of Supercritical Heat Transfermentioning

confidence: 99%

“…d u Numerical predictions from Pitla et al (2001b) Average of wall and bulk heat transfer based on Gnielinski (1976) correlation with property corrections specific flow pattern that exists for the applicable conditions. However, most of these studies on high pressure refrigerant focused on R410A at low reduced pressures (low saturation temperatures).…”

Section: Supercritical Heating and Coolingmentioning

confidence: 99%

Heat transfer and pressure drop of refrigerant R404A at near-critical and supercritical pressures

Jiang

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Convective Heat Transfer from In-Tube Flow of Turbulent Supercritical Carbon Dioxide: Part 1—Numerical Analysis

Cited by 34 publications

References 13 publications

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

A Review of Flow and Heat Transfer Characteristics of Supercritical Carbon Dioxide under Cooling Conditions in Energy and Power Systems

Modeling of the Heat Transfer in a Supercritical Co2/Dme Mixture Flowing in Cooled Helically Coiled Tubes

Heat transfer and pressure drop of refrigerant R404A at near-critical and supercritical pressures

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