1,721,125 research outputs found
Numerical study of mixed convection in a horizontal no parallel-plates channel with an unheated moving plate
No full textPurpose–The purpose of this paper is to analyze the thermal and fluid dynamic behaviors of mixed convection in air because of the interaction between a buoyancy flow and a moving plate induced flow in a horizontal no parallel-plates channel to investigate the effects of the minimum channel spacing, wall heat flux, moving plate velocity and converging angle.
Design/methodology/approach–The horizontal channel is made up of an upper inclined plate heated at uniform wall heat flux and a lower adiabatic moving surface (belt). The belt moves from the minimum channel spacing section to the maximum channel spacing section at a constant velocity so that its effect interferes with the buoyancy effect. The numerical analysis is accomplished by means of the finite volume method, using the commercial code Fluent.
Findings–Results in terms of heated upper plate and moving lower plate temperatures and stream function fields are presented. The paper underlines the thermal and fluid dynamic differences when natural convection or mixed convection takes place, varying minimum channel spacing, wall heat flux, moving plate velocity and converging angle.
Research limitations/implications–The hypotheses on which the present analysis is based are two-dimensional, laminar and steady state flow and constant thermo physical properties with the Boussinesq approximation. The minimum distance between the upper heated plate of the channel and its lower adiabatic moving plate is 10 and 20 mm. The moving plate velocity varies in the range 0-1 m/s; the belt moves from the right reservoir to the left one. Three values of the uniform wall heat flux are considered, 30, 60 and 120 W/m2, whereas the inclination angle of the upper plate is 2° and 10°.
Practical implications–Mixed convection because of moving surfaces in channels is present in many industrial applications; examples of processes include continuous casting, extrusion of plastics and other polymeric materials, bonding, annealing and tempering, cooling and/or drying of paper and textiles, chemical catalytic reactors, nuclear waste repositories, petroleum reservoirs, composite materials manufacturing and many others. The investigated configuration is used in applications such as re-heating of billets in furnaces for hot rolling process, continuous extrusion of materials and chemical vapor deposition, and it could also be used in thermal control of electronic systems.
Originality/value–This paper evaluates the thermal and velocity fields to detect the maximum temperature location and the presence of
fluid recirculation. The paper is useful to thermal designers
Numerical Visualization of Full Elliptic Numerical Solution of Transient Natural Convection in Open-Ended Cavities
No full textTransient Analysis of Natural Convection in a Horizontal Open Ended Cavity
No full textpaper n.IMECE2002-3299
Correlations for mixed convection in an open ended cavity with a moving plate parallel to the cavity open surface
No full textThermal and fluid dynamic behavior of a horizontal channel with adiabatic moving lower plate
No full textpaper IMECE2005-8225
Advanced modeling of liquid movements in automotive fuel tanks
No full textA complex activity is taking place to enhance design and validation of automotive fuel tanks. It includes track tests, a new bench tests and fluid-dynamic simulations. The target is to prevent issues with vapor pressure build up and fuel spill to vapor canister, operating as early as possible in the design process. CFD simulations have been used to assess the accuracy of bench tests compared to road tests and the work goes on to perform predictive analysis.
A new test bench has been developed, based on FIAT specification and experience, which allows to simulate vehicle accelerations using a combination of tank motion and tilt on all axes. Numerical tests have been performed which confirms the validity of the test approach. Accelerometric measurements have confirmed the substantial equivalence.
Additional numerical analyses have been performed to explore fluid dynamic inside the tank, targeted to evolve the CFD approach into a design validation and optimization tool
Radiative Effects on Natural Convection in a Vertical Channel with an Auxiliary Parallel Plate
No full text
Radiative Effects on Natural Convection in a Vertical Channel with an Auxiliary Parallel Plate
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