Using of nanofluids and ducts with corrugated walls are both supposed to enhance heat transfer, by increasing the heat transfer fluid conductivity and the heat transfer area respectively. Use of a diverging duct with a jet at inlet section may further increase heat transfer by creating recirculation zones inside the duct. In this work two-dimensional incompressible laminar flow of a nanofluid e...

cooling towers are widely used in most industrial units to reject waste heat to the atmosphere. this paper deals with an experimental analysis of heat and mass transfer phenomena between water and air by direct contact in a cooling tower. the tower is filled with 6 type packing. in this study temperature and pressure drop and tower characteristics was used in determining experimentally the ther...

Film cooling is widely applied as an effective way to maintain the turbine blade temperature at acceptable level. The present paper investigates overall effectiveness and flow structure by performing conjugate heat transfer simulations for flat-plate baseline cylindrical three cratered film-cooling holes. in fluid domain obtained using Shear Stress Transport turbulence model, solid conductivity...

• Conjugate heat transfer in a Roots blower. Gap size calibration achieved deviation of 7.5% on flow and 4.3% power. Discharge air temperature was within 4 °C. High speed infrared thermography based surface 6 Oil-free blower is type Positive Displacement Machine used for low pressure ratio applications. Its volumetric efficiency dependent the leakage compressed gas through clearance gaps. In ab...

A numerical study using the conjugate heat transfer approach has been performed to investigate effects of boundary flux, conduction effect, and working fluid on thermal characteristics due jet impingement process. Air water are used in this as fluids. For jet, volume method is capture track interface multiphase flow. It found that wall may change fluid-solid interfacial compared with no or pure...

As much as two-phase mixture models resolve more physics than single-phase homogeneous models, their inconsistent heat transfer predictions have limited use in modelling nanofluid cooled minichannel sinks. This work investigates, addresses, and solves this key shortcoming, enabling reliable physically sound of nanoflows, using the model. It does so by applying model to a nine-passages rectangul...

An adaptive mesh strategy for the numerical simulation of incompressible transient flows with heat transfer and mass transport is presented in this work. The Finite Element technique, with unstructured meshes formed by tetrahedral elements, and the two-step Taylor-Galerkin method are used. The velocity field is obtained by an explicit scheme, while pressure field is computed by an implicit sche...

Turbulent heat transfer in Helically Corrugated Tubes (HCT) was numerically investigated for pure water and SiO2 nanofluid using Computational Fluid Dynamics (CFD). This study was carried out for different corrugating pitches (5, 7, 8 mm) and heights (0.5, 0.75, 1.25 mm) at various Reynolds numbers ranging from 5000 to 13300. The effect of nanoparticles on heat transfer augmentation for plain t...