**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**10

# Search results for: buoyancy

##### 10 Effect of Buoyancy Ratio on Non-Darcy Mixed Convection in a Vertical Channel: A Thermal Non-equilibrium Approach

**Authors:**
Manish K. Khandelwal,
P. Bera,
A. Chakrabarti

**Abstract:**

**Keywords:**
buoyancy ratio,
mixed convection,
non-Darcy model,
thermal non-equilibrium

##### 9 Dynamics of a Vapour Bubble inside a Vertical Rigid Cylinder in the Absence of Buoyancy Forces

**Authors:**
S. Mehran,
S. Rouhi,
F.Rouzbahani,
E. Haghgoo

**Abstract:**

**Keywords:**
Vapour bubble,
Vertical rigid cylinder,
Boundaryelement method,
Finite difference method,
Buoyancy forces.

##### 8 Vortex-Shedding Suppression in Mixed Convective Flow past a Heated Square Cylinder

**Abstract:**

**Keywords:**
bluff body,
buoyancy,
free-stream orientation,
vortex-shedding.

##### 7 Viscosity Model for Predicting the Power Output from Ocean Salinity and Temperature Energy Conversion System (OSTEC) Part 1: Theoretical Formulation

**Authors:**
Ag. S. Abd. Hamid,
S. K. Lee,
J. Dayou,
R. Yusoff,
F. Sulaiman

**Abstract:**

The mixture between two fluids of different salinity has been proven to capable of producing electricity in an ocean salinity energy conversion system known as hydrocratic generator. The system relies on the difference between the salinity of the incoming fresh water and the surrounding sea water in the generator. In this investigation, additional parameter is introduced which is the temperature difference between the two fluids; hence the system is known as Ocean Salinity and Temperature Energy Conversion System (OSTEC). The investigation is divided into two papers. This first paper of Part 1 presents the theoretical formulation by considering the effect of fluid dynamic viscosity known as Viscosity Model and later compares with the conventional formulation which is Density Model. The dynamic viscosity model is used to predict the dynamic of the fluids in the system which in turns gives the analytical formulation of the potential power output that can be harvested.

**Keywords:**
Buoyancy,
density,
frictional head loss,
kinetic power,
viscosity.

##### 6 Prediction of Solidification Behavior of Al Alloy in a Cube Mold Cavity

**Authors:**
N. P. Yadav,
Deepti Verma

**Abstract:**

**Keywords:**
Buoyancy driven flow,
natural convection driven
flow,
residual flow,
secondary flow,
volume of fluid.

##### 5 An Integrated CFD and Experimental Analysis on Double-Skin Window

**Authors:**
Sheam-Chyun Lin,
Wei-Kai Chen,
Hung-Cheng Yen,
Yung-Jen Cheng,
Yu-Cheng Chen

**Abstract:**

**Keywords:**
Solar energy,
Double-skin façades,
Thermal
buoyancy,
Fluid machinery.

##### 4 Mixed Convection Boundary Layer Flows Induced by a Permeable Continuous Surface Stretched with Prescribed Skin Friction

**Authors:**
Mohamed Ali

**Abstract:**

**Keywords:**
Stretching surface,
Boundary layers,
Prescribed skin friction,
Suction or injection,
similarity solutions,
buoyancy effects.

##### 3 Numerical Study of Laminar Mixed Convection Heat Transfer of a Nanofluid in a Concentric Annular Tube Using Two-Phase Mixture Model

**Authors:**
Roghayyeh Motallebzadeh,
Shahin Hajizadeh,
Mohammad Reza Ghasemi

**Abstract:**

Laminar mixed Convection heat transfer of a nanofluid with prescribed constant heat flux on the inner wall of horizontal annular tube has been studied numerically based on two-phase mixture model in different Rayleigh Numbers and Azimuth angles. Effects of applying of different volume fractions of Al_{2}O_{3} nanoparticles in water as a base fluid on hydrodynamic and thermal behaviors of the fluid flow such as axial velocity, secondary flow, temperature, heat transfer coefficient and friction coefficient at the inner and outer wall region, has been investigated. Conservation equations in elliptical form has been utilized and solved in three dimensions for a steady flow. It is observed that, there is a good agreement between results in this work and previously published experimental and numerical works on mixed convection in horizontal annulus. These particles cause to increase convection heat transfer coefficient of the fluid, meanwhile there is no considerable effect on friction coefficient.

**Keywords:**
Buoyancy force,
Laminar mixed convection,
Mixture model,
Nanofluid,
Two-phase.

##### 2 Numerical Solution of Transient Natural Convection in Vertical Heated Rectangular Channel between Two Vertical Parallel MTR-Type Fuel Plates

**Authors:**
Djalal Hamed

**Abstract:**

The aim of this paper is to perform, by mean of the finite volume method, a numerical solution of the transient natural convection in a narrow rectangular channel between two vertical parallel Material Testing Reactor (MTR)-type fuel plates, imposed under a heat flux with a cosine shape to determine the margin of the nuclear core power at which the natural convection cooling mode can ensure a safe core cooling, where the cladding temperature should not reach a specific safety limits (90 °C). For this purpose, a computer program is developed to determine the principal parameters related to the nuclear core safety, such as the temperature distribution in the fuel plate and in the coolant (light water) as a function of the reactor core power. Throughout the obtained results, we noticed that the core power should not reach 400 kW, to ensure a safe passive residual heat removing from the nuclear core by the upward natural convection cooling mode.

**Keywords:**
Buoyancy force,
friction force,
friction factor,
finite volume method,
transient natural convection,
thermal hydraulic analysis,
vertical heated rectangular channel.

##### 1 Steady State Natural Convection in Vertical Heated Rectangular Channel between Two Vertical Parallel MTR-Type Fuel Plates

**Authors:**
Djalal Hamed

**Abstract:**

**Keywords:**
Buoyancy force,
friction force,
friction factor,
MTR-type fuel,
natural convection,
vertical heated rectangular channel.