Research on Heat-Transfer and Three-Dimensional Characteristics of Natural Convection in a Small Cavity With Heat Sources

Zhan, N.Y.; Xu, Yue; Wang, Zhiyun

doi:10.18280/ijht.330308

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…This is the main source of heat flowing into the roller. However, the roller temperature will decrease rapidly under crossventilation and water cooling [14], So it is necessary to consider the influence of convective cooling in the boundary condition [15]. With the rotation of the roller, the temperature near the slab increases.…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Application of zirconia thermal barrier coating on the surface of pulling-straightening roller

Zhang¹,

Sun²,

Xie³

et al. 2017

IJHT

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This paper aims to extend the service life of pulling-straightening rollers. For this purpose, a zirconia thermal barrier coating (TBCs) was prepared on the roller surface, and the properties of TBCs prepared by plasma spraying and laser remelting were investigated separately. Then, the surface temperature distribution of roller was calculated with ABAQUS. Next, the conventional zirconia and nanoscale zirconia were coated on H13 steel, and observed using a confocal laser scanning microscope and a thermomechanical simulator. It is found that TBCs can reduce the roll surface temperature and thus the thermal stress; both laser remelting and nanoscale zirconia can improve the quality and thermal shock resistance of the coating. This research on TBC properties lays a solid basis for the application of the TBC on pulling-straightening roller.

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Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Application of zirconia thermal barrier coating on the surface of pulling-straightening roller

Zhang¹,

Sun²,

Xie³

et al. 2017

IJHT

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“…According to the viewpoint of materialist dialectics, the external performance of material is its internal properties embodiment, and the properties of matter also have certain relation. If we regard the the fracture acidizing well production as external embodiment of reservoir internal properties, well then, the fracture acidizing well production is certainly relative to properties of minerals, pore space and fluid (Zhan et al,2015). As a result, we should firstly study the relation between internal properties and sensitivity of reservoirs, in order to find out the main internal factors influencing the fracture acidizing well production (Qiu et al,2005).…”

Section: Influencing Factorsmentioning

confidence: 99%

Research and Application of Hybrid PSO-BP Neural Network In fracture acidizing well production prediction

Zhang¹

2016

Revista de la Facultad de Ingeniería

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In this paper, the limitations of conventional BP algorithm were analyzed, and to enhance its generalization capability of the network, the PSO (particle swarm optimization) algorithm was used to optimize the initial weights of nodes in BP neural network and overcome the over-fitting problem and the local minimum problem of the BP neural network. A new algorithm PSO-BP was studied by giving full play to both of the PSO algorithm's global optimization ability and BP algorithm's local search advantage, the model can overcome the slow convergence and easily getting into the local extremum of basic BP algorithm, and can also improve the learning ability and generalization ability with a higher precision. To demonstrate the capacity of the proposed model, we applied the model to the prediction of the fracture acidizing well production. The mean prediction accuracy of the PSO-BP algorithm is 93.56%, and the mean prediction accuracy of the BP algorithm is 87.73%. The results show that the prediction system based on PSO-BP network is more accurate than traditional BP network, so the algorithm based on PSO-BP network model provides a more accurate, safe and reliable result for the fracture acidizing well production prediction.

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“…When the natural convection is controlled by the extremes difference temperature of the walls, the dimension of the secondary recirculation zone is it very small. Zhan et al [8] investigate by the numerical simulation of the Natural convection in a small cavity with one, two, and three heat sources. They indicate that that the number of vortices increases and the air temperature increase with supplementary heat sources and the heat transfer is enhanced when the heat source is close to the center relatively than near the boundary.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Moving Wall to the Thermal and Dynamic Field in a Square Cavity with a Heat Source

Sahnoun¹,

Habib²,

Ismail³

2022

IJHT

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This study deals with convective heat transfer in a square cavity with a localized heat source at its center. The form factor of this configuration is (h/H=0.6) which is the ratio between the height of the source and the height of the cavity. The Rayleigh number is Ra=106 that indicated a laminar flow in this cavity. The numerical simulation gives a good result compared to the experimental data, which justifies the choice of our models used in this study. The objective is to make this natural convection a forced convection by the mobility of the upper wall. This made it possible to change the concentration of the state parameters in this cavity. This result can be used to make an orientation of the heat in this cavity. We note the use of four (4) speeds of the mobile wall in order to see the influence of the speed of this north wall on the convection phenomenon.

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Research on Heat-Transfer and Three-Dimensional Characteristics of Natural Convection in a Small Cavity With Heat Sources

Cited by 5 publications

References 3 publications

Application of zirconia thermal barrier coating on the surface of pulling-straightening roller

Application of zirconia thermal barrier coating on the surface of pulling-straightening roller

Research and Application of Hybrid PSO-BP Neural Network In fracture acidizing well production prediction

Effect of the Moving Wall to the Thermal and Dynamic Field in a Square Cavity with a Heat Source

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