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n-heptanes
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Experimental and simulation investigation on separation of binary hydrocarbon mixture by thermogravitational column
, Article Journal of Molecular Liquids ; Volume 268 , 2018 , Pages 791-806 ; 01677322 (ISSN) ; Karimi Sabet, J ; Motahari, K ; Mahruz Monfared, S ; Amini, Y ; Moosavian, M. A ; Sharif University of Technology
Elsevier B.V
2018
Abstract
In this article, experimental and numerical investigations are performed to study a thermogravitational column (TGC) for the separation of toluene/n-heptane mixture. This research has tried to determine the main significant parameters and their effects on the performance of the process. In experimental examinations, the influence of the main parameters such as feed flow rate, cut and temperature gradient on the performance of the TGC efficiency is studied. In addition, computational fluid dynamics is used to simulate the separation process in this review. The response surface methodology (RSM) was also applied to minimize the number of runs and investigate the optimum operating conditions....
Simulation and Charcterestitic Study of Combustion System of a High Speed Engine
, M.Sc. Thesis Sharif University of Technology ; Mazaheri, Karim (Supervisor)
Abstract
In this thesis a combustion chamber of a liquid-fueled ramjet missile will be simulated. At first a history of construction and designing of ramjet missiles will be expressed then studies in the filled of simulation and optimization of combustion chamber will be expressed. In this simulation for modeling of spray increasing accuracy we used Lagrangian method. All simulations are done in the fluent software. For validation, we simulated the experimental model that was examined by Sasaki et. Al. and observed that our result are almost matched with their experimental data. Finally for simulation we selected the ramjet engine of Markudet Company. Selected fuel is liquid n-Heptan. One of the...
Numerical study of n-heptane/benzene separation by thermal diffusion column
, Article Chinese Journal of Chemical Engineering ; Volume 27, Issue 8 , 2019 , Pages 1745-1755 ; 10049541 (ISSN) ; Karimi Sabet, J ; Motahari, K ; Mahruz Monfared, S ; Amini, Y ; Moosavian, M. A ; Sharif University of Technology
Chemical Industry Press
2019
Abstract
In this article, numerical simulations are performed to investigate the performance of the thermal diffusion column for the separation of n-heptane/benzene mixture. The present work tried to optimize column by analyzing significant parameters such as feed flow rate, temperature and cut. In order to obtain the hydrodynamic and temperature and mass distribution inside thermal diffusion column, computational fluid dynamic (CFD) method is applied to solve the Navier–Stocks equations. Numerical simulations are conducted to study the main parameters in both stationary and time-dependent conditions. By using the separation work unit as a function of cut, the optimal cut for maximum SWU occurs...
An experimental study on the effect of hydrogen enrichment on diesel fueled HCCI combustion
, Article International Journal of Hydrogen Energy ; Volume 36, Issue 21 , 2011 , Pages 13820-13830 ; 03603199 (ISSN) ; Hosseini, V ; Neill, W. S ; Chippior, W. L ; Dumitrescu, C. E ; Sharif University of Technology
Abstract
This paper experimentally investigates the influence of hydrogen enrichment on the combustion and emission characteristics of a diesel HCCI engine using a modified Cooperative Fuel Research (CFR) engine. Three fuels, n-heptane and two middle distillates with cetane numbers of 46.6 and 36.6, are studied. The results show that hydrogen enrichment retards the combustion phasing and reduces the combustion duration of a diesel HCCI engine. Besides, hydrogen enrichment increases the power output and fuel conversion efficiency, and improves the combustion stability. However, hydrogen enrichment may narrow the operational compression ratio range and increase the knocking tendency. Both the overall...