3D numerical simulation of laminar forced-convection flow subjected to asymmetric thermal conditions. An application to solar thermal collectors

Seco-Nicolás, Manuel; Alarcón, Mariano López; Luna-Abad, Juan Pedro

doi:10.1016/j.solener.2021.02.022

Cited by 8 publications

(15 citation statements)

References 44 publications

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“…A complete description of the circuit construction as well as computing details of the simulation can be found in the Appendix and reference [42]. In order to know the numerical value of the different electrical components forming out network (resistors, voltage and current sources, etc.…”

Section: The Network Modelmentioning

confidence: 99%

“…The 3D numerical model built following these rules and using the parameters mentioned in the previous section was validated by comparing its results to literature and experimental data [42].…”

Section: Model Validationmentioning

confidence: 99%

“…Open-source software NGSpice [40], originally created for electric circuit analysis, has been used in our case to solving this problem; also proprietary software such as Pspice© [41] can be used for this purpose. The model has been validated by experimental results obtained in an experimental solar thermal plant [42].…”

Section: Introductionmentioning

confidence: 99%

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Forced Laminar Flow in Pipes Subjected to Asymmetric External Conditions: The HEATT© Platform for Online Simulations

Alarcón¹,

Seco-Nicolás²,

Luna-Abad³

et al. 2023

Pipeline Engineering - Design, Failure, and Management

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This chapter studies the fluid flow within pipes subjected to thermal asymmetrical boundary conditions. The phenomenon at hand takes place in many real-world industrial situations, such as solar thermal devices, aerial pipelines. A steady-state analysis of laminar forced-convection heat transfer for an incompressible Newtonian fluid is studied. The fluid is considered to flow through a straight round pipe provided with straight fins. For the case studied, axial heat conduction in the fluid has been considered and the effects of the forced convection have been considered to be dominant. A known uniform temperature field is applied at the upper external surface of the assembly. The 3D assembly has been created combining cylindrical and Cartesian coordinates. The governing differential equation system is solved numerically through suitable discretization in a set of different finite volume elements. The results are shown through the thermal profiles in respect of longitudinal and radial-azimuthal coordinates and the problem characteristic length. To facilitate the resolution of this phenomenon, an open computing platform called HEATT©, based on this model, has been developed, and it is also shown here. The platform is now being built and is expected to be freely available at the end of year 2022.

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Section: The Network Modelmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

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Forced Laminar Flow in Pipes Subjected to Asymmetric External Conditions: The HEATT© Platform for Online Simulations

Alarcón¹,

Seco-Nicolás²,

Luna-Abad³

et al. 2023

Pipeline Engineering - Design, Failure, and Management

Self Cite

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show abstract

“…Larsen-Basse found that the cutting friction generated between the drill bit and the wall of hole in the process of drilling rock can cause the temperature of the drill bit reaching about 500 °C. The instantaneous high temperature of the drill bit reached 1000 °C, while 70–95% of the energy obtained by the drill bit was consumed in heating . Abbas et al found that the absorption coefficient of the drilling tool affected the cutting temperature by simulating the heat distribution of twist drill pipe drilling.…”

Section: Introductionmentioning

confidence: 99%

“…The instantaneous high temperature of the drill bit reached 1000 °C, while 70−95% of the energy obtained by the drill bit was consumed in heating. 18 Abbas 19 et al found that the absorption coefficient of the drilling tool affected the cutting temperature by simulating the heat distribution of twist drill pipe drilling. When the cutting edge breaks hard rock, most of the cutting work is converted into cutting heat, resulting in a rapid increase in bit temperature.…”

Section: Introductionmentioning

confidence: 99%

Temperature of the Core Tube Wall during Coring in Coal Seam: Experiment and Modeling

Wang

Yue

et al. 2022

ACS Omega

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Temperature is the primary factor affecting the law of coal gas desorption. When the core method is used to measure the coal seam gas content (CSGC), the temperature of the coal core sample (CCS) will increase because the heat generated by the core bit cutting and rubbing the coal is transferred to the CCS through the core tube. To solve the above problems, the temperature of the core tube wall during coring at core depths of 10, 20, and 30 m was measured by a self-designed temperature measuring device. The thermodynamic models of the core bit and the core tube during coring were established. The thermal flux of the system at different stages was inverted numerically by the dichotomy method. The reliability of the model was verified by comparing the numerical simulation results with the field measurement results. The main influencing factors during coring were studied by numerical simulations. The results show that the temperature change of the core tube wall goes through four stages: slowly rising, fast rising, slowly rising, and slowly falling, which correspond to the process of pushing the core tube, drilling the CCS, and the early stage and later stage of withdrawing the core tube, respectively. The maximum temperature of the core tube wall appears in the first 5 min of withdrawing the core tube and increases with the increase of core depth. When the core depth is 30 m, the maximum temperature of the core tube wall reaches 105.17 °C. The temperature of the measuring point at the end of drilling the CCS and the maximum temperature during coring linearly increase with the core depth, friction heat generated while pushing the core tube, and coal strength. This study can provide a basis for further research on the dynamic distribution characteristics of temperature in the CCS during coring, which is of profound significance to calculate the gas loss amount and CSGC.

et al. 2023

Results in Engineering

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3D numerical simulation of laminar forced-convection flow subjected to asymmetric thermal conditions. An application to solar thermal collectors

Cited by 8 publications

References 44 publications

Forced Laminar Flow in Pipes Subjected to Asymmetric External Conditions: The HEATT© Platform for Online Simulations

Forced Laminar Flow in Pipes Subjected to Asymmetric External Conditions: The HEATT© Platform for Online Simulations

Temperature of the Core Tube Wall during Coring in Coal Seam: Experiment and Modeling

HEATT©. A free software for thermal design of liquid flows inside pipes

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