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Recent Trends in Fluid Mechanics

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Millifluidica

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Mechanics. The intension of RTFM is to create an atmosphere that stimulates creativeness, research

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Dr. Archana Mehrotra

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STM JOURNALS

1. Fluid Flow and Solidification Analysis in Gravity Die Casting (GDC) Mahendra H.M., Ashwin C. Gowda, D.P. Girish 1

2. Development of Inhibitive Water-based Drilling Fluid System for Shale Formation Rajat Jain, Tinku Saikia, Vikas Mahto 12

ContentsRecent Trends in Fluid Mechanics

RTFM (2014)© STM Journals 2014. All Rights Reserved

Recent Trends in Fluid Mechanics

Volume 1, Issue 3

www.stmjournals.com

Fluid Flow and Solidification Analysis in Gravity

Die Casting (GDC)

Mahendra H.M.1, Ashwin C. Gowda

2*, D.P. Girish3

1Department of Mechanical Engineering, RRCE, Bangalore, Karnataka, India

2Department of Computer Aided Engineering, VTU-Visvesvaraya Institute of Advanced Technology,

Muddenahalli Chickballapura 562101, India 3Professor & Head Mechanical Engineering, GEC Ramanagaram, Karnataka, India

Abstract Gravity die casting is a process wherein the fluid metal is poured into metallic moulds without application of any external force. The fluid metal enters the cavity by gravity

method. In the design of dies for GDC, usage of “cores” is an important issue. The

undercuts and the hollow shapes are produced with the help of additional mould parts called “cores”. For simple shapes without any under cuts the metallic cores could be

used, whereas for undercuts and complex hollow shapes, which are difficult to retract, sand or plaster of Paris cores are employed. The gravity die casting process is required

for huge volume production of non ferrous alloy castings of aluminum, magnesium,

copper and zinc base alloys and to limited extent for cast iron castings. Castings can be produced by operation of dies manually or by automatic devices or through die casting

machines based on the body of production. The die materials used are gray cast iron and

steels. The GDC process is ensuring to achieving 20% higher mechanical properties than that of a sand casting because of quick rate of solidification imparting better grain size.

The process can be automated and also can produce semi-gravity die-castings using sand or plaster of paris cores for production of interior details. In this study the Housing

casting part produced were defective due to improper gating design, riser design, air

entrapment, cold metal, etc. Using Advanced Simulation Software I have analyzed the problems existing and implemented such that defect free and quality castings are

produced. The process is implemented to get good quality and defect free casting.

Keywords: die casting, GDC process, grain size, cores

RTFM (2014)© STM Journals 2014. All Rights Reserved

Recent Trends in Fluid Mechanics

Volume 1, Issue 3

www.stmjournals.com

Development of Inhibitive Water-based Drilling Fluid

System for Shale Formation

Rajat Jain, Tinku Saikia, Vikas Mahto*

Department of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand, India

Abstract The drilling of troublesome shale formations leads to severe wellbore instability problems

due to swelling and dispersion of the shale cuttings in the welllbore. Hence, the

formulation of inhibitive water-based drilling fluid system with enhanced rheological properties and filtration characteristics is a critical issue for these complex shale

formations. This research article consists of a favourable drilling fluid system developed

using potassium chloride (KCL), partially hydrolyzed polyacrylamide (PHPA), ethylene glycol and xanthan gum polymer. The rheological properties and filtration

characteristics were measured as per API recommended standard procedures for field testing of drilling fluids. The developed system has low plastic viscosity, good gel

strength, high consistency index, and moderate apparent viscosity for the optimum

performance of the drilling fluid system while dealing with shale formations. The developed drilling fluid formulations exhibited low fluid loss volume during the filtration

studies. This system has high inhibition property which controls the hydration and dispersion of the shale cuttings inside the wellbore. Hence, developed inhibitive water-

based drilling fluid system may be suitable for the drilling of sensitive shale formations.

Keywords: drilling fluid, rheological properties, filtration characteristics, inhibition