Heat transfer from the internal surfaces of a vertical pipe to the adjacent air gives rise to the air flow establishment within the pipe. With the aim of optimizing the convective air flow rate in a vertical pipe, the details of the flow and thermal fields were investigated in the present study. Conservation equations of mass, momentum, and energy were solved numerically using simple implicit f...

3 Glenn Morrison 4 Department of Civil, Architectural and Environmental Engineering 5 University of Missouri-Rolla, 221 Butler-Carlton Hall, Rolla, MO 65409-0030 6 7 Abstract 8 9 Spatial distributions in surface flux and concentrations complicate the 10 measurement of surface mass-transfer coefficients can bias the resulting estimates of 11 indoor exposure. To better understand these phenomena,...

in this paper the numerical analysis of flow and time dependent heat transfer of micro-tube conveying nanofluid in laminar flow is investigated. in this study, convection heat transfer of nanofluid and base fluid and transient analysis for time-varying heat flux for time step of 0.0001 second are elucidated. it is observed that the pumping power of nanofluid flowing and the maximum temperature ...

In this study, condensation heat transfer coefficients of R-410A were obtained in flattened stainless tubes made from 5.0 mm inner diameter round tubes. The test range covered saturation temperature 45 , heat flux 10 °C kW/m, mass flux 100~400 kg/ms and quality 0.2~0.8. Results showed the effect of aspect ratio on condensation heat transfer coefficient was dependent on the flow pattern. For ann...

In the present work, macroscopic governing equations heat and mass transfer for a general multicomponent system are derived via systematic nonequilibrium thermodynamics framework. contrast to previous approaches, relative (with respect average velocity) component fluxes (relative species momenta) flux treated explicitly, in complete analogy with momentum flux. The framework followed here, addit...

Nucleate pool boiling heat transfer coefficient have been experimentally measured on a horizontal rod heater for various liquid binary mixtures. Measurements are based on more than three hundred data points on a wide range of concentrations and heat fluxes. In this investigation, it has been confirmed that the heat transfer coefficient in boiling solutions are regularly less than those in p...

A unique approach to simulate mass transfer across the moving droplet where mass transport equations and governing equations of the levels set method are solved separately is proposed in this work. Mass transfer coefficients of the chemical species can be computed by equating the diffusive flux and the mass transfer flux at the interface, which are found to be of the same order of magnitude as ...

We show that the 1996 outburst of the X-ray binary transient system GRO J1655–40 can be explained by the standard dwarf-nova type disc instability, followed by an episode of enhanced mass transfer from the secondary if the mass transfer rate in GRO J1655–40 is within a factor ∼ < 10 of the stability limit. We argue that irradiation of the secondary during the onset of the outburst driven by the...

This article presented a numerical investigation of supercritical heat transfer of hydrocarbon fuel in a series of horizontal tubes with different diameters. It has been carried out by solving Reynolds averaging equations of mass, momentum and energy with the LS low-Reynolds number turbulence model using the pressure-based segregated solver based on the finite volume method. For the purpose of ...