نتایج جستجو برای: filling fluid

تعداد نتایج: 255664  

ASGARY K., , ATTAR E., , BABAEI R., , DAVAMI P., , HOMAYONIFAR P., ,

During mold filling, molten metal can only advance as quickly as the air inside thecavity is expelled. In this work an analytical model describing air flow is developed based on aincompressible flow theory. Air pressure has serious effects upon the filling behaviour such assurface profile and filling time. In this work a new mathematical model is proposed for calculationthe air pressure during ...

ASHOURI H., , DAVAMI P., , MIRBAGHERI S.M.H., , VARAHRAM N., ,

In this investigation a new model was developed to calculate gas pressure at the melt/foam interface (Gap) resulting from foam degradation during mould filling in the Lost Foam Casting (LFC) process. Different aspects of the process, such as foam degradation, gas elimination, transient mass, heat transfer, and permeability of the refractory coating were incorporated into this model. A Computati...

پایان نامه :0 1371

the treatment of in completely formed pulpless teeth has presented considrable problems. these teeth have wide open apexes and the walls of the root canal diverge toward the apical tissues. mechanical preparation cannot be done in the normal manner beacause of the large initial size and the taper of apical part of the canal , a mechanical stop cannot be produced at the apex of the canal and , t...

2017
Ioannis Zacharoudiou Emily M. Chapman Edo S. Boek John P. Crawshaw

The aim of this work is to better understand fluid displacement mechanisms at the pore scale in relation to capillary-filling rules. Using specifically designed micro-models we investigate the role of pore body shape on fluid displacement during drainage and imbibition via quasi-static and spontaneous experiments at ambient conditions. The experimental results are directly compared to lattice B...

BABAEI R., , DADASHZADEH M., , DAVAMI P., , HOMAYONIFAR P., , SHAHINFAR S., ,

In the present study a Finite Difference Method has been developed to model the transient incompressible turbulent free surface fluid flow. A single fluid has been selected for modeling of mold filling and The SOLA VOF 3D technique was modified to increase the accuracy of simulation of filling phenomena for shape castings. For modeling the turbulence phenomena k-e standard model was used. In or...

In this paper the heat transfer characteristics of a two-phase closed thermosyphon over a wide range of heat transfer rates, system pressure, aspect ratios and filling ratios were studied. The experiments focused on the boiling and condensation heat transfer characteristics of a thermosyphon with a copper tube having 25 and 32 mm inside and outside diameters. Distilled water was used as the wor...

BABAEI R., , DAVAMI P., , SABZEVARZADEH A., , VARAHRAM N., ,

In this investigation, ^5 2-D Finite Volume Method (FVM) with unstructured triangular mesh is developed to simulate the mould filling process. The simulation of fluid flow and track of free surface is based on the Marker And Cell (MAC) technique. This technique has capability ofhandling the arbitrary curved solid boundaries in the casting processes. In order to verify the computational results ...

2011
Ronald J Trof Ibrahim Danad Mikel WL Reilingh Rose-Marieke BGE Breukers AB Johan Groeneveld

INTRODUCTION Static cardiac filling volumes have been suggested to better predict fluid responsiveness than filling pressures, but this may not apply to hearts with systolic dysfunction and dilatation. We evaluated the relative value of cardiac filling volume and pressures for predicting and monitoring fluid responsiveness, according to systolic cardiac function, estimated by global ejection fr...

Journal: :Journal of Physics: Conference Series 2021

Journal: :iranian endodontic journal 0
mohammad ali saghiri islamic azad university of medical sciences jack ricci , new york university morteza daliri joupari 3. national institute for genetic engineering and biotechnology mohammad aeinehchi islamic azad university of medical sciences kamran ahmadi 5. material and energy research center (merc), karaj, iran niloofar bahramian islamic azad university of medical sciences

introduction : solubility of root filling materials is heavily influenced by the environment they are in contact with. this study compared the solubility of proroot mta in deionized water and synthetic tissue fluid. materials & methods: forty specimens of prepared mta were immersed in deionized water and synthetic tissue fluid (20 samples each). the solubility was assessed after 7 and 28 days. ...

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