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A novel correlation approach to estimate thermal conductivity of pure carbon dioxide in the supercritical region
, Article Journal of Supercritical Fluids ; Volume 64 , 2012 , Pages 39-45 ; 08968446 (ISSN) ; Heidaryan, E ; Sharif University of Technology
2012
Abstract
In this paper, a new correlation to calculate the thermal conductivity of supercritical carbon dioxide based on 668 data points from the literature is introduced. The proposed correlation is valid in temperature range from 310 to 960 K, and pressures range between 7.4 and 210 MPa. The average absolute error of the model was found to be 2.7 and 2.4% in the comparison with the literature and NIST data respectively, which demonstrates superiority of the model over other methods
PC-SAFT modeling of petroleum reservoir fluid phase behavior using new correlations for petroleum cuts and plus fractions
, Article Fluid Phase Equilibria ; Volume 408 , 2016 , Pages 273-283 ; 03783812 (ISSN) ; Ghotbi, C ; Tavakkoli, M ; Bashiri, G ; Sharif University of Technology
Elsevier
Abstract
Parameters of the PC-SAFT Equation of State (EoS) for pure components are generally determined by matching the saturation pressure and liquid density experimental data. These experimental data are unavailable for petroleum cuts and plus fractions of the petroleum reservoir fluids. In this work, new correlations as functions of specific gravity and molecular weight were developed to estimate the PC-SAFT parameters of petroleum cuts with unknown composition. It was shown that the proposed correlations accurately estimate the PC-SAFT parameters of the pure components published in the literature. Then, the obtained correlations were used and the PVT experimental data for various real reservoir...
Experimental study on viscosity of spinel-type manganese ferrite nanofluid in attendance of magnetic field
, Article Journal of Magnetism and Magnetic Materials ; Volume 428 , 2017 , Pages 457-463 ; 03048853 (ISSN) ; Amani, P ; Kasaeian, A ; Mahian, O ; Kasaeian, F ; Wongwises, S ; Sharif University of Technology
Abstract
In this paper, an experimental evaluation on the viscosity of water-based manganese ferrite nanofluid with and without magnetic field with 100, 200, 300, and 400 G intensities has been conducted. The Brookfield DV-I PRIME viscometer is implemented to measure the MnFe2O4/water nanofluid viscosity and to evaluate the influence of different volume concentrations (from 0.25% to 3%) and various temperatures (from 20 to 60 °C) on the viscosity. According to the measurements, viscosity incrementally increases with the augmentation of nanoparticles concentration while it remarkably decreases at higher temperatures under absence and attendance of magnetic field. The maximum viscosity ratio of 1.14 is...
Numerical simulation of MHD mixed convection flow of Al2O3–water nanofluid over two hot obstacles
, Article Heat Transfer ; Volume 51, Issue 4 , 2022 , Pages 3237-3256 ; 26884534 (ISSN) ; Saidi, M. H ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
The problem of cooling two hot blocks in a novel geometry using magnetohydrodynamic flow of Al2O3–water nanofluid has been studied utilizing a D2Q9 Lattice Boltzmann Model. While the Hartmann number (Ha) takes 0, 50, or 100 values, the Richardson number (Ri) varies between 0.02 and 20. Four variations of the geometry are selected. The gravity angle is set to be either (Formula presented.), (Formula presented.), or (Formula presented.). Results reveal that the Nusselt number (Nu) increases as Ri increases for all cases. Furthermore, the Hartmann number has a deteriorating effect on the Nusselt number except for low Ri numbers. In addition, the results indicate that while the geometrical...
Toward reservoir oil viscosity correlation
, Article Chemical Engineering Science ; Volume 90 , 2013 , Pages 53-68 ; 00092509 (ISSN) ; Khishvand, M ; Naseri, A ; Mohammadi, A. H ; Sharif University of Technology
2013
Abstract
Oil viscosity plays a key role in reservoir simulation and production forecasting, as well as planning thermal enhanced oil recovery methods and these make its accurate determination necessary. In this communication, the most frequently used oil viscosity correlations are evaluated using a large databank of Iranian oil reservoirs which were measured using a Rolling Ball viscometer (Ruska, series 1602). To evaluate the performance and accuracy of these correlations, statistical and graphical error analyses have been used simultaneously. Three of the most accurate correlations for each region, including dead oil viscosity, viscosity below bubble point, viscosity at bubble point and the...
New correlations for predicting pure and impure natural gas viscosity
, Article Journal of Natural Gas Science and Engineering ; Volume 30 , 2016 , Pages 364-378 ; 18755100 (ISSN) ; Shams, R ; Ghazanfari, M. H ; Sharif University of Technology
Elsevier
2016
Abstract
Accurate determination of natural gas viscosity is important for successful design of production, transportation, and gas storage systems. However, most of available models/correlations suffer from complexity, robustness, and inadequate accuracy especially when wide range of pressure and temperature is applied. Present study illustrates development of two novel models for predicting natural gas viscosity for pure natural gas (CH4) as well as natural gas containing impurities. For this purpose, 6484 data points have been gathered and analyzed from the open literature covering wide range of pressure, temperature, and specific gravity levels, temperature ranges from -262.39 to 620.33 °F (109.6...
Effects of membrane compliance on pore water pressure generation in gravelly sands under cyclic loading
, Article Geotechnical Testing Journal ; Volume 33, Issue 5 , 2010 ; 01496115 (ISSN) ; Shakeri, M. R ; Sharif University of Technology
Abstract
The paper deals with an experimental study of the undrained cyclic behavior of a natural coarse sand and gravel deposit located in Tehran, a megacity situated on the continental side of the Alborz Mountain in Iran. Membrane compliance that plays a significant role in inhibiting redistribution of pore pressure and liquefaction in undrained cyclic triaxial tests performed on coarse granular soils is studied in this paper. Currently there is no or little satisfactory method for accounting for this phenomenon for gravelly soils, and thus the non-compliant cyclic loading resistanceof granular soils and the evaluation of the behavior of such material in natural and in situ state are not easily...