1,721,076 research outputs found
Numerical Analysis of buoyant Prandtl number fluids with varaible thermophysical properties between vertical parallel plattes with high isoflux heating
No full textNUMERICAL INVESTIGATION ON THE EFFECTS OF NATURAL GAS AND HYDROGEN BLENDS ON ENGINE COMBUSTION
No full textNumerical Thermal Analysis of an Electric Oven for Neapolitan Pizzas
No full textNeapolitan pizza is traditionally cooked in wood-fired ovens ensuring high quality in cooking pizza and providing an excellence in Italian cooking tradition. Besides safeguarding Italian cooking tradition, in recent years there is a growing attention on wood-fired oven impacts both on indoor and outdoor air quality and pollution. Thus, optimal design of electric ovens alternative to wood-fired ones is an interesting concern in order to achieve both high quality of Neapolitan pizza cooking and air pollution prevention. This paper deals with a numerical investigation on thermal conditions provided by an innovative electric oven for Neapolitan pizzas cooking. A three-dimensional numerical model has been developed based on a finite volume scheme to simulate steady and unsteady operating conditions. Radiation effects of inner walls have been considered and the boundary effects of the oven, both radiative and convective, have been carefully modelled. Results have been examined in terms of heat flux distributions, temperature and velocity fields, showing good cooking conditions for pizzas
Influence of intense symmetric heating and variable physical properties on the thermo-buoyant airflow inside vertical parallel-plate channels.
No full textThis paper deals with the steady, laminar, and two-dimensional
natural convection inside vertical parallel-plate channels with
isoflux heating. The main objective of this paper is to assess the
joint influence of intense heating and variable physical properties
on the flow and heat transfer characteristics of the upward air. To
capture the physics of the problem, the discretized conservation
equations are solved by the finite-volume technique in an aggrandized
computational domain that is much larger than the physical
domain. Representative numerical results based on the FLUENT
computer program are presented in terms of local quantities such
as air velocity and temperature profiles, as well as global quantities
such as the average heat transfer coefficients and mass flow
rates, all in response to the controlling geometrical and thermal
parameters. A detailed comparison of these results is made
against those produced by the simple model limited to constant
physical properties
Meshless Approach for Computing the Heat liberation from Annular Fins of Tapered Cross Section
No full textThis technical note addresses an extremely simple computational procedure for solving the complex quasi-one dimensional heat equation with variable coefficients that governs the temperature change in annular fins of hyperbolic profile cooled by a fluid. The salient feature of the computational procedure is the convenient linkage of the finite-difference method with a meshless approach. Using a very coarse mesh, accurate estimates for the temperature distribution and heat liberation from annular fins of hyperbolic profile have been obtained by hand solving small systems of three algebraic equation
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