Simulation of coupled heat transfers in a hollow tile with two vertical and three horizontal uniform rectangular cavities heated from below or above

Ait-Taleb, T.; Abdelbaki, Abdelhalim; Zrikem, Z.

doi:10.1016/j.enbuild.2014.09.010

Cited by 18 publications

(8 citation statements)

References 9 publications

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“…Whereas the other part studied the effect of radiation exchange between cavity surfaces on natural convection [9][10]. Recently, Ait-Taleb et al [11][12][13] presented a series of numerical studies that take into account the three modes of heat transfer in alveolar blocks heated from below or above, but submitted to the imposed temperatures excitation. These studies play an important role in simulating the thermal performance and optimizing the configurations of the hollow block.…”

Section: Introductionmentioning

confidence: 99%

Coupled heat transfers in a three cavity hollow block subjected to an incident solar flux: Effect of heat conductivity

Najjaoui¹,

Ait-Taleb²,

Abdelbaki

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Hollow blocks or bricks are widely used due to the good thermal insulation, lightweight, and acoustic insulation etc. In this paper, we present a numerical study of heat transfers coupled by natural convection and radiation conduction through a hollow block with three cavities used for the construction of ceilings of buildings. This hollow block is subjected to an incident solar flux and exchanging heat with the air ambient. The governing equations of the mathematical model used for the simulation are discretized by the finite volume method and solved by the SIMPLE algorithm. The main objective of this simulation is to study, in steady state, the effect of the thermal conductivity of the solid partitions on heat flux through this hollow block. The results are presented in terms of streamlines, the isotherms, temperature profiles on the actives surfaces and the obtained global heat flux.

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Section: Introductionmentioning

confidence: 99%

Coupled heat transfers in a three cavity hollow block subjected to an incident solar flux: Effect of heat conductivity

Najjaoui¹,

Ait-Taleb²,

Abdelbaki

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

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“…Heat convection is used to analyze transfer heat on the interaction surface of fluid and structure. Solid heat transfer equation 25 is applied to evaluate the structural temperature distribution in the process of structure thermal analysis. The equations of thermal analysis principles are in which T 0 , C p , K, W v , Q v , E k , and Φ are the total temperature, specific heat, heat conductivity coefficient, viscous dissipation, volume heat source, kinetic energy, and the item of viscous heat, respectively.…”

Section: Two-way Fluid-thermal-solid Coupling Analysis Of Bliskmentioning

confidence: 99%

Probabilistic analysis method of turbine blisk with multi-failure modes by two-way fluid-thermal-solid coupling

Yang

Fei

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study develops multi-extremum response surface method (MERSM) for the probabilistic analysis of aeroengine turbine blisk with the coexistence of many failure modes by considering two-way fluid-thermal-solid coupling under complex working condition. The mathematical model of MERSM was established with respect to the random input variables of inlet temperature, inlet velocity, density of material, and rotor speed, and the output responses of the maximum values of deformation, stress, and strain. The comprehensive probabilistic analysis of turbine blisk was completed based on MERSM. The results demonstrate that the comprehensive reliability degree of turbine blisk is 0.9944 when the allowable deformation, stress, and strain are 2.6 × 10−3 m, 1.26 × 109 Pa, and 6.75 × 10−3 m/m, respectively. The main factors influencing the comprehensive reliability degree of turbine blisk are rotor speed and gas temperature. The secondary factors are inlet velocity and density of material. As revealed from the comparison of methods, MERSM improves the computational speed and efficiency with the guarantee of accuracy. The efforts of this paper provide a promising approach for the nonlinear transient reliability analysis of complex structures with multi-failure modes and two-way fluid-thermal-solid coupling.

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“…More broadly, it was the cognitive assumptions embedded in risk models used widely by banks and regulators alike that led each to believe that the risks both at the micro level of individual institutions, and at the macro‐systemic level, were far less, and of a different nature, than they turned out to be. If you do not understand how the system works, it is very hard to build in mechanisms either for managing risk or for ensuring the system's resilience when those risks crystallise. The crisis has prompted fundamental cognitive shifts in understandings of how the financial system operates, and the manageability of high impact but low probability events.…”

Section: Understanding ‘New Governance’ Paradoxes and Failuresmentioning

confidence: 99%

Paradoxes and Failures: ‘New Governance’ Techniques and the Financial Crisis

Black

2012

Modern Law Review

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This article examines the performance of four 'new governance' techniques of regulation in the period leading up to the financial crisis: principles based regulation, risk based regulation, meta-regulation and enrolment.These techniques have been advocated on the basis that they are responsive, flexible, and in enrolling others in the regulatory project thereby expand its capacity, and even its legitimacy. However, experience in the crisis revealed that in their implementation they can be out of touch or indulgent, focus heavily on auditable systems and processes, and that in enrolling others they can increase vulnerabilities and the potential for negative endogenous effects.The argument is not that there should be a return to adversarial 'command and control' regulation, rather that experience of these strategies in the crisis suggests a need to understand in greater depth the refractive effects of the organisational, technical/functional and cognitive dimensions of regulatory governance, if we are to understand and adapt its performance in different contexts.

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Simulation of coupled heat transfers in a hollow tile with two vertical and three horizontal uniform rectangular cavities heated from below or above

Cited by 18 publications

References 9 publications

Coupled heat transfers in a three cavity hollow block subjected to an incident solar flux: Effect of heat conductivity

Coupled heat transfers in a three cavity hollow block subjected to an incident solar flux: Effect of heat conductivity

Probabilistic analysis method of turbine blisk with multi-failure modes by two-way fluid-thermal-solid coupling

Paradoxes and Failures: ‘New Governance’ Techniques and the Financial Crisis

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