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Simulation and Investigation of Mechanical Behavior of Non Pneumutic Tires
, M.Sc. Thesis Sharif University of Technology ; Arghavani Hadi, Jamal (Supervisor)
Abstract
Due to the relatively high freedom of selection of materials associated with a simple manufacturing method, a nonpneumatic tire (NPT) can be manufactured with low viscoelastic energy loss material. NPTs consisting of flexible spokes and the shear band are still at an early stage of research and development. An optimization study of NPTs’ geometry needs to be conducted, which is the objective of this thesis. Parametric studies and design of experiments (DOE) of an NPT are conducted with a hyper-viscoelastic finite element (FE) model to determine the effects of four design variables on rolling resistance, contact pressure and vertical deflection. Considering vehicle load carrying capacity and...
Simulation of the interaction between nonspherical particles within the CFD–DEM framework via multisphere approximation and rolling resistance method
, Article Particulate Science and Technology ; 2015 , Pages 1-11 ; 02726351 (ISSN) ; Behzad, M ; Rajabi, M ; Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
The particle shape is an important factor playing critical role in evaluation of the interactions between particles in high-concentration particle-fluid flows. In this paper, the well-known multisphere (MS) approximation approach and the novel rolling resistance approach are utilized to examine their performance in order to simplify the generalized shaped particle’s interactions within the framework of discrete element method (DEM) and computational fluid dynamics (CFD). The performance of two approaches are compared with the perfect particle’s shape geometry, for the limited cases of cubic-shaped and disk-shaped particle flows in a horizontal well drilling process as a reference scenario....
Simulation of the interaction between nonspherical particles within the CFD–DEM framework via multisphere approximation and rolling resistance method
, Article Particulate Science and Technology ; Volume 34, Issue 4 , 2016 , Pages 381-391 ; 02726351 (ISSN) ; Behzad, M ; Rajabi, M ; Sharif University of Technology
Taylor and Francis Inc
Abstract
The particle shape is an important factor playing critical role in evaluation of the interactions between particles in high-concentration particle-fluid flows. In this paper, the well-known multisphere (MS) approximation approach and the novel rolling resistance approach are utilized to examine their performance in order to simplify the generalized shaped particle’s interactions within the framework of discrete element method (DEM) and computational fluid dynamics (CFD). The performance of two approaches are compared with the perfect particle’s shape geometry, for the limited cases of cubic-shaped and disk-shaped particle flows in a horizontal well drilling process as a reference scenario....
Effects of resistive loads and tire inflation pressure on tire power losses and CO2 emissions in real-world conditions
, Article Applied Energy ; Volume 157 , November , 2015 , Pages 974-983 ; 03062619 (ISSN) ; Nasiri, S ; Karkhaneh, V ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
Considerable portion of energy losses in a vehicle traced to tire. Energy losses in a tire are due to tire longitudinal slip as well as rolling resistance. Hence, both of aforementioned factors must take into the consideration to study the tire energy loss. Present paper aims to investigate the power losses in tires and to examine influence of road conditions and tire inflation pressure on them. To cover the real-world conditions, experiments were done on a gasoline-fueled passenger vehicle on an urban highway along two routes with same length and opposite gradients to comprise the change of road conditions. Then, by use of engine performance model which is prepared in dynamometer...
Effects of resistive loads and tire inflation pressure on tire power losses and CO2 emissions in real-world conditions
,
Article
Applied Energy
;
2015
;
ISSN: 03062619
; Nasiri, S
; Karkhaneh, V
;
Sharif University of Technology
Abstract
Considerable portion of energy losses in a vehicle traced to tire. Energy losses in a tire are due to tire longitudinal slip as well as rolling resistance. Hence, both of aforementioned factors must take into the consideration to study the tire energy loss. Present paper aims to investigate the power losses in tires and to examine influence of road conditions and tire inflation pressure on them. To cover the real-world conditions, experiments were done on a gasoline-fueled passenger vehicle on an urban highway along two routes with same length and opposite gradients to comprise the change of road conditions. Then, by use of engine performance model which is prepared in dynamometer...
Toward a hydrocarbon-based chemical for wettability alteration of reservoir rocks to gas wetting condition: implications to gas condensate reservoirs
, Article Journal of Molecular Liquids ; Volume 248 , 2017 , Pages 100-111 ; 01677322 (ISSN) ; Ghazanfari, M. H ; Sharif University of Technology
Abstract
Recently, wettability alteration has been much attended by researchers for studying well productivity improvement in gas condensate reservoirs. Previous studies in this area only utilized water/alcohol based chemicals for this purpose. While, hydrocarbon nature of the blocked condensate in retrograde gas reservoirs, may motivate application of hydrocarbon based chemical agents. In this study, a new hydrocarbon based wettability modifier is introduced to alter wettability of carbonate and sandstone rocks to preferentially gas wetting condition. Static and dynamic contact angle measurements, spontaneous imbibition and core flooding tests were conducted to investigate the effect of proposed...
Compare numerical modeling and improved understanding of dynamic sessile drop contact angle analysis in Liquid-Solid-Gas system
, Article Journal of Petroleum Science and Engineering ; Volume 184 , 2020 ; Ghazanfari, M. H ; Dehghan Monfared, A ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Dynamic contact angle measurement; as a standard method for surface wettability analysis, is usually conducted through the analysis of sessile drops formed following the low rate injection of fluid from beneath through a drilled hole via an injection needle. However, understanding/characterizing the changes of drop contact angle from the point where the flat solid surface begins is not well discussed yet. Moreover, during the evaluation of size-dependent behavior of contact angle of millimeter-scale drops, the effect of the drilled hole is ignored. In this regard, in the current study, the experimental and thermodynamic characterizations of the sessile drop advancing contact angle...