A successful general fluid-to-fluid similarity theory for heat transfer at supercritical pressure

Pucciarelli, Andrea; Ambrosini, Walter

doi:10.1016/j.ijheatmasstransfer.2020.120152

Cited by 26 publications

(3 citation statements)

References 13 publications

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“…Kassem et al 28 developed a fluid to fluid similarity theory to analyze the heat transfer behavior of water, normalCO 2, ammonia and R23 at supercritical pressure condition. In this article, the experimental results performed with dimensional quantities showed a similar trend for all the fluids 29,30 . Zhang et al 31 considered the mixture of normalCO 2 and propane for the experimental analysis of a heat pump.…”

Section: Introductionsupporting

confidence: 62%

Steady-state and nonlinear stability analysis for the feasibility of different fluids in a supercritical natural circulation loop

Raghuvanshi

Dutta

Panda

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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A numerical model for a supercritical natural circulation loop is developed to examine the flow instabilities by nonlinear stability analysis. The supercritical natural circulation loop is a loop geometry, which is driven by natural circulation with supercritical fluids as a coolant. A mathematical formulation is developed to study the steady-state and transient solution procedure for supercritical natural circulation loop. This mathematical model is then used to perform various parametric studies with different supercritical fluids (water, [Formula: see text], R134a, ammonia, R22, propane, and isobutane). The behavior of all the fluids is analyzed on identical geometrical and operating conditions. A comprehensive numerical study of the nonlinear stability analysis is presented with particular emphasis on the feasibility of various fluids in a natural circulation loop environment. The 50% increment in loop diameter and height increased the stable operating zones and shifted the marginal stability boundary upward respectively by approximately three times and 25–40% of the previous value. However, further increase in diameter and height reduces the increment of stable operating zones; hence the marginal stability boundary shifts upward marginally than the previous value. Furthermore, the marginal stability boundaries are generated to identify the stable and unstable zones for the available geometrical and operating conditions.

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Section: Introductionsupporting

confidence: 62%

Steady-state and nonlinear stability analysis for the feasibility of different fluids in a supercritical natural circulation loop

Raghuvanshi

Dutta

Panda

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…To ensure the validity of the results obtained from the scaled experimental model, a similarity analysis between the scaled model and the prototype building must be conducted. According to relevant research [33,34], the Reynolds number (Re) and Archimedes number (Ar) can be used as the similarity criterion. Indeed, achieving complete identity across all criteria besides the Prandtl number (Pr) is widely acknowledged as impractical.…”

Section: Scaled Experimental Model For Validationmentioning

confidence: 99%

Investigation on the Natural Convection Inside Thermal Corridors of Industrial Buildings

Pu,

Zhu,

et al. 2024

Buildings

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The installation of successional heating devices in industrial buildings will result in thermal corridors. To improve the thermal environment in and around these corridors, buoyancy-driven ventilation is commonly utilized to dissipate heat, which is based on the natural convection design for buildings. However, the flow and heat exchange patterns of natural convection related to thermal corridors have not been clearly clarified, and no relevant correlations have been established to quantify them. The conducted numerical study aimed to analyze the flow and heat transfer characteristics of natural convection within thermal corridors in industrial buildings. Experimental data were utilized to validate a computational fluid dynamics (CFD) model developed for this purpose. The study considered the influence of various parameters on the results obtained. In the side corridor, the prevalence of reverse flow dominates much of the channel, while in the middle corridor, reverse flow near the bottom corner is observed. The ambient air temperature significantly impacts the temperature distribution in both corridors. Increasing the ambient air temperature at the inlet from 22 to 28 °C results in a substantial temperature rise within the corridor, by approximately 6–7 °C. When the outlet size is constant and the inlet size drops by 30%, the air temperature in the corridor increases by 3 °C. Finally, correlations were established based on the simulation data to predict the surface-averaged Nu¯ of the heated wall and the induced mass flow rate, m˙, of the natural convection. The correlations have relative errors of less than 16% when compared to the simulation data.

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“…Klein et al 5 built a new regularized, parameter free scale similarity type model for Large Eddy, which exhibits good performance for a variety of mesh resolutions and for all configurations. Pucciarelli and Ambrosini 6 introduced a general fluid-to-fluid similarity theory for heat transfer at supercritical pressure, and the RANS CFD analysis of four different fluids was carried out by using this theory. Bao et al 7 used deep learning to explore local physical similarity for global-scale bridging in thermal-hydraulic simulation, which makes it effective to evaluate mesh effect or model scalability independently.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic characteristics analysis of a multiscale hemispherical dynamic pressure motor based on similarity theory

Niu

Wang

Sun

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hemispherical dynamic pressure motors (HDPMs) are used in high precision gyroscope instruments, and the aerodynamic characteristics of gas in bearing clearance have an important influence on gyroscope accuracy. Due to the multiscale structure of the gas domain, there are few valuable studies on the aerodynamic characteristics of the HDPM. In this paper, a calculation model of HDPM was established based on similarity theory and computational fluid dynamics (CFD) method, which was solved under different conditions. The results indicate that the load force and resistance torque of the gas film are inversely proportional to the clearance size between the stator and rotor, which are also significantly related to the gas viscosity and the type of pressure outlet. This work can provide a method for the investigation of dynamic pressure characteristics for the multiscale fluid, and can also provide a reference for the optimal design and fault diagnosis of dynamic pressure motors.

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A successful general fluid-to-fluid similarity theory for heat transfer at supercritical pressure

Cited by 26 publications

References 13 publications

Steady-state and nonlinear stability analysis for the feasibility of different fluids in a supercritical natural circulation loop

Steady-state and nonlinear stability analysis for the feasibility of different fluids in a supercritical natural circulation loop

Investigation on the Natural Convection Inside Thermal Corridors of Industrial Buildings

Aerodynamic characteristics analysis of a multiscale hemispherical dynamic pressure motor based on similarity theory

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