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Showing 3 results for Taghilou
Volume 13, Issue 13 (First Special Issue 2014)
Abstract
Two-phase flow modeling has been the subject of many investigations. However, fewer studies are corresponded for two-phase flow within a porous medium, because of additional complications. In this paper, two-phase flow with the density and viscosity ratio of 1, within a porous medium is simulated by Shan and Chen model. Due to inherent limitations and weaknesses of this approach in an independent control of surface tension, investigation of parameters such as Reynolds number, Froude and Weber is not applicable. However, porous medium parameters such as Darcy number and contact angle could be studied by changing the porous medium and contact angle. Competition between opposing forces against the drop and the capillary effect because of increasing the number of particles in the porous media is described using the Darcy number. Also the effect of the contact angle between liquid-gas phases and the solid surface is evaluated on the droplet penetration inside the porous medium.
Volume 16, Issue 8 (10-2016)
Abstract
The use of phase-change material to enhance the capacity of energy storage/release is the subject of many new researches on management of the energy supply. Study of these systems is directly related to the solid-liquid phase-change problem, in which the evaluation of temperature distribution, position of phase-change front and liquid or solid fraction becomes a basic problem. Study of freezing and melting process with regard to natural convection in the liquid phase is the main purpose of the present paper. For this purpose, a rectangular finned container of phase-change material is intended. Fins are used to enhance the heat transfer rate. This fact necessitates the use of immersed boundary condition on the solid phase. Hence, the melting process considering the both effects of natural convection and movement of solid phase is studied. The freezing process is also studied taking into accounts the natural convection with no need to impose the immersed boundary condition. Lattice Boltzmann method is used as a numerical method and results are reported based on the dimensionless parameters. Based on the results, the effects of natural convection is negligible during freezing process, while imposing the effects of natural convection provides a significant change in the required time for complete melting of the phase change material.
Volume 28, Issue 2 (6-2024)
Abstract
The economic significance of regions in the context of attracting capital and trade on a global scale is paramount to fostering economic development within a globalized framework. Concurrently, international capital predominantly gravitates towards regions that possess the capability to yield profits and exhibit the requisite potential for augmenting the added value of capital. This investigation delves into the capabilities of Iranian provinces within the global economy, utilizing an integrated approach that encompasses regionalism and the global payment chain. The methodology employed in this study is characterized as applied, with a descriptive and analytical framework. Data collection was conducted through a combination of documentary research and fieldwork, drawing from statistical sources and authoritative research findings. A variety of statistical methodologies, including regression and correlation analyses, were employed to facilitate the examination of the data. The findings of this study revealed that the economic contributions of diverse geographical regions within Iran were heterogeneous. Regions that demonstrated substantial success in attracting international capital did not necessarily correlate with an enhancement in exports and foreign trade; moreover, the performance of various geographical areas varied significantly across the studied indicators and did not adhere to a consistent principle or rule. In essence, the positioning of Iranian regions in terms of capital attraction, exports, imports, or trade within a specific year appears to be somewhat arbitrary, necessitating a longitudinal analysis to thoroughly elucidate the influence of the variables employed in determining the global economic status of these regions.