Abstract Buoyancy-induced flow occurs inside the rotating compressor cavities of gas turbines. These are usually open at inner radius, but in some industrial turbines, they effectively closed. This paper presents measurements disk heat transfer and structures a closed cavity over wide range engine relevant conditions. experimentally derived distributions temperature flux first their kind to be ...

Turbulent convection is often present in liquids with a kinematic viscosity much smaller than the diffusivity of the temperature. Here we reveal why these convection flows obey a much stronger level of fluid turbulence than those in which kinematic viscosity and thermal diffusivity are the same; i.e., the Prandtl number Pr is unity. We compare turbulent convection in air at Pr=0.7 and in liquid...

In turbulent mixed convection conditions, flow and heat transfer can deteriorate under specific thus affecting the performance of safety system, which could imperil nuclear reactor. this paper, by analyzing velocity, temperature distributions, other thermal-hydraulic parameters, steady-state computational fluid dynamics approach with SST k–? turbulence model used in study was verified. Then, ch...

The purpose of this study is the investigation heat transfer and fluid flow around a heated solid block inside lid-driven cavity filled with hybrid TiO2-Cu/water nanofluid. considered geometry two-dimensional an aspect ratio 5. upper wall translates uniform velocity Ulid. attached to bottom maintained at high temperature compared lower walls, whereas other walls are kept insulated. nanofluid as...

Mechanisms have allowed for the automation of complex, repetitive, demanding, or dangerous tasks humans. Among different mechanisms, those with a closed kinematic chain are more precise and robust compared to open ones, which makes them suitable many applications. One most widely used closed-chain alternatives is four-bar Grashof-type mechanism, as it can generate highly nonlinear trajectories ...

Blood flow through a sclerotic artery and the effect of thermal heat on cholesterol concentration in presence magnetic field are modelled using mathematical models which represent blood momentum coupled with buoyancy due to temperature, concentration, porosity medium effect. The study involved formulation geometry atherosclerosis at specific location sclerosis over time arterial channel. system...

Effect of rotation on nonlinear solutal convection during protein cystallization is modelled and studied computationally under both normal and microgravity conditions. The axis of the externally imposed rotation, which is assumed to be either parallel or antiparallel to the gravity vector, is assumed to be inclined at an angle γ with respect to the axis of the crystal. In addition to the angle ...

Mixed convection in an obstructed cavity with heated horizontal walls is investigated in this work. Brinkman-Forchheimer-extended Darcy model is utilized to describe the flow characteristics within a porous medium for different angles of attack with respect to the forced convection. Numerical results are obtained for a wide range of Grashof numbers (10–10), Reynolds numbers (10–10), Darcy numbe...

Limiting currents were measured for deposition of copper on plane vertical cathodes from unstirred solutions. Electrolyte composition ranged from 0.01 to 0.7 molal CuSO4, 1.38 to 1.57 molal H2SO4, and 0 to 6.38 molal glycerol. Cathode heights varied from 0.25 to 3.0 in. Limiting current densities were from 0.4 to 108 ma/cm 2. A general correlation of the data may be represented by the equation:...