A study of turbulent heat transfer in curved pipes by numerical simulation

Liberto, Massimiliano Di; Ciofalo, Michele

doi:10.1016/j.ijheatmasstransfer.2012.12.011

Cited by 39 publications

(11 citation statements)

References 40 publications

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“…It is one of the latest developments in a long suite of finite volume CFD codes which have successfully been applied through the years by the authors' research group to a variety of fluid dynamics problems, including laminar, transitional and turbulent flow in curved pipes [10,11,29].…”

Section: Methodsmentioning

confidence: 99%

Fully developed laminar flow and heat transfer in serpentine pipes

Ciofalo

Liberto

2015

International Journal of Thermal Sciences

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Section: Methodsmentioning

confidence: 99%

Fully developed laminar flow and heat transfer in serpentine pipes

Ciofalo

Liberto

2015

International Journal of Thermal Sciences

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“…The term d [8] is defined as the ratio between the duct radius and the curvature radius of the same. Figure 8 is illustrative of this definition.…”

Section: Thermo-fluid Dynamics Analysismentioning

confidence: 99%

“…Therefore, it is necessary to derive the convective coefficients through an a posteriori calculation of the simulations performed. As the authors Di Liberto and Ciofalo suggest in their work about numerical analysis of turbulent flows in curved pipes [8], the Nusselt number is obtained as a function of the average outgoing or incoming power flow across the exchange surface (q w ), as a function of average temperature of the same surface (T w ) and the average temperature of the entire fluid volume (T b ).…”

Section: Comparison With Empirical Correlationsmentioning

confidence: 99%

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Performance of Dish-Stirling CSP system with dislocated engine

Kaliakatsos

Cucumo

Ferraro

et al. 2015

Int J Energy Environ Eng

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In this paper, a Dish-Stirling Concentrating Solar Power (CSP) system was examined in which the engine works no longer as a receiver but is displaced away from it. In this arrangement it is necessary to adopt a heat transfer fluid capable of transmitting the useful power from the receiver to the hot spring in the Stirling engine head. Various components of the system need designing and especially the heat exchanger in charge of transferring power to the engine head thanks to the cooling of the fluid. The Dish-Stirling system under study includes a linear piston Stirling engine of 4 kW total rated power (3 kW thermal and 1 kW electric). The minimum temperature for starting of the engine is 190°C, while the maximum is 565°C. There are many innovative aspects of dish Concentrating Solar Power systems with Stirling engine dislocated, for example, the possibility of using an increased number of engines powered by a single greater dish and energy savings in the solar tracking system. The work covers the search for the most suitable fluids for the purpose, risks and benefit evaluation of fluids never used previously in the field of solar concentration. The heat exchanger sizing was carried out examining different geometric configurations. The study was conducted using a computer and setting up thermo-fluid dynamics simulations in the ANSYS 14.5 environment. Finally, the results were tested and validated through a comparison study with empirical correlations found in the literature.

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“…Di Liberto and Ciofalo [17] studied the heat transfer of turbulent flow in curved tubes by numerical simulation. They also used this method to survey a fully developed turbulent flow in curved tubes.…”

Section: Introductionmentioning

confidence: 99%

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

Andrzejczyk¹,

Muszyński²

2016

Archives of Thermodynamics

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The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil, centrifugal force is acting on the moving fluid due to the curvature of the tube results in the development. It has been long recognized that the heat transfer in the helical tube is much better than in the straight ones because of the occurrence of secondary flow in planes normal to the main flow inside the helical structure. Helical tubes show good performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. Authors have presented their own construction of shell and tube heat exchanger with intensified heat transfer. The purpose of this article is to assess the influence of the surface modification over the performance coefficient and effectiveness. The experiments have been performed for the steady-state heat transfer. Experimental data points were gathered for both laminar and turbulent flow, both for co current-and countercurrent flow arrangement. To find optimal heat transfer intensification on the shell-side authors applied the number of transfer units analysis.

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A study of turbulent heat transfer in curved pipes by numerical simulation

Cited by 39 publications

References 40 publications

Fully developed laminar flow and heat transfer in serpentine pipes

Fully developed laminar flow and heat transfer in serpentine pipes

Performance of Dish-Stirling CSP system with dislocated engine

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

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