The entropy generation analysis of fully turbulent convective heat transfer to nanofluids in a circular tube is investigated numerically using the Reynolds Averaged Navier–Stokes (RANS) model. The nanofluids with particle concentration of 0%, 1%, 2%, 4% and 6% are treated as single phases of effective properties. The uniform heat flux is enforced at the tube wall. To confirm the validity of the...

A new finite volume algorithm has been developed to solve a variety of flows by using large eddy simulation and direct numerical simulation. This finite volume algorithm was developed using a dual time stepping approach with a preconditioning technique and a new factorization implementation. The method takes the advantage of pressure-based and density-based meth­ ods. Thus, it provides an effic...

An experimental investigation has been carried out to study the turbulent flow heat transfer and to determine the pressure drop characteristics of air, flowing through a tube with insert. An insert of special geometry is used inside the tube. The test section is electrically heated, and air is allowed to flow as the working fluid through the tube by means of a blower. Air velocity, air inlet an...

Computational study was carried out to determine average heat transfer coefficients and friction factors for turbulent flow through rectangular ducts with ribs. A commercial finite volume package ANSYS FLUENT 12.1 is used to analyze and visualize the nature of the flow across the ribbed duct The fluid in the duct was air, and the average heat transfer coefficients were determined by measuring t...

The sparse tall grass significantly affects the heat and moisture exchange in the lower atmosphere through the turbulent transfer coefficient inside its environment. Common approaches for calculation of turbulent transfer coefficient inside the tall grass environment are based on the assumption that it depends either on wind speed or mixing length inside the canopy. In this paper we suggested a...

Project Overview Interrupted-fin surfaces are used to enhance the air-side heat transfer performance in many compact heat exchangers. While many empirical correlations are available in the open literature for offset-strip and louvered-fin geometries, local heat transfer behavior on individual fins is not as well understood. A redesign of these surfaces may result in higher heat transfer. Inlet ...