a theoretical solution is presented for the forced convection heat transfer of a viscoelastic fluid obeying the giesekus constitutive equation in a concentric annulus under steady state, laminar, and purely tangential flow. a relative rotational motion exists between the inner and the outer cylinders, which induces the flow. a constant temperature was set in both cylinders, in this study. the f...

This paper experimentally studies the heat absorption performance of a heat sink with vertical embedded heat pipes in the aluminum blade. The cooling system with embedded heat pipes distributes heat from the CPU to both the base plate and the heat pipes, and then transfer heat from fins to the Environment. The thermal resistance and heat transfer coefficient are evaluated for natural convection...

The flow field of the proton exchange membrane fuel cell (PEMFC) controls mass and water transfer; it significantly impacts cell's performance. It is critical to innovate design for optimizing This paper proposes a new-designed (NDFF) patterned with built-in blockage trap-shape rib association. novel was analyzed numerically experimentally. A three-dimensional isothermal numerical model first e...

Context. Eccentric accretion disks in superoutbursting cataclysmic and other binary systems. Aims. We study the development of finite eccentricity in accretion disks in close binary systems using a grid-based numerical scheme. We perform detailed parameter studies to explore the dependence on viscosity, disk aspect ratio, the inclusion of a mass-transfer stream and the role of the boundary cond...

A 2D axisymmetric computational fluid dynamics (CFD) model, coupled to a 1D bed has been developed capture the key processes that occur within rotary lime kilns. The model simulates calcination reaction using shrinking core and predicts start of degree at end kiln. heat transfer due radiation, convection conduction between gas, wall, chains, bed. gas models are by mass sinks simulate transfer, ...

This paper deals with numerical study of semi-finite incompressible flow of air over two blocks with different heights in the presence of a condensing-source, dispensing- contaminant in the flow, in both steady and unsteady states. The numerical solution of governing PDE equations are constructed by a finite-volume method applied on structured grid arrangement. The effects of air flow velocity,...

We studied extremely fast kinetics of an outer-sphere heterogeneous electron transfer (ET) reaction at a single Pt nanoparticle (NP) using the newly adapted Kotecký-Levich (K-L) method. In this work, an electrode was prepared by nucleating and growing a single Pt NP on a tunneling ultramicroelectrode (TUME) that produces 1-40 nm or greater dimensions. Such a small-size electrode greatly enhance...