Search results for "NTU method"

showing 3 items of 3 documents

Large-Eddy Simulation of Flow and Heat Transfer in Compact Heat Exchangers

1994

LES results are presented for different heat exchanger geometries. Subgrid terms were usually computed by the Smagorinsky model; preliminary comparative results are also given for the ‘dynamic’ subgrid model. The numerical methods used were those implemented in a commercial general-purpose code (CFDS-FLOW3D); they included a finite-volume approach, colocated body-fitted grids, central differencing for the advection terms, the SIMPLEC algorithm, and Crank-Nicolson time stepping. Predictions arc compared with experimental measurements (including local Nu distributions), and with results from a low-Reynolds number k-e model. In most cases, LES was more ‘robust’ and required little more CPU tim…

Plate heat exchangerMechanicsComputational Fluid DynamicSIMPLEC algorithmLarge Eddy SimulationPhysics::Fluid DynamicsNTU methodMoving bed heat exchangerHeat transferCompact Heat ExchangerMicro heat exchangerPlate fin heat exchangerSettore ING-IND/07 - Propulsione AerospazialeSettore ING-IND/19 - Impianti NucleariLarge eddy simulation
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A method for the calculation of the heat transfer coefficient in potato drying

1993

A method for the determination of the heat transfer coefficient was proposed for the first falling drying period of potato cubes. During this period, heat and mass transfer were considered as coupled phenomena. Temperature calculation inside the sample was performed using the macroscopic heat transfer balance. The heat transfer coefficient was computed by means of parametric identification, using the Gauss–Newton method. The figure obtained for the heat transfer coefficient shows good agreement with other sources.

Nutrition and DieteticsNTU methodChemistryMass transferHeat transferFilm temperatureHeat transfer coefficientMechanicsParametric identificationAgronomy and Crop ScienceChurchill–Bernstein equationFood ScienceBiotechnologyJournal of the Science of Food and Agriculture
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Application of Mathematical Models in Analysis of Heat Losses in the Buildings

2006

Physical model of heat balance for separate living room is discussed, which allows to analyse the distributions of the flow of air and temperature depending on the physical conditions and geometry. The model enables to choose the optimal surface area of building elements and their properties in order to decrease the heat losses and improve the conditions of thermal comfort. Room with bounding constructions and real dimensions is modelled that helps to understand the peculiarities of heat transfer process in the room as well as distribution of various characteristic quantities and their dependence on the different conditions. Multiple parameters are varied in 2D calculations and their influe…

Sigma heatNTU methodConvective heat transferChemistryHeat transferMechanical engineeringThermal contactmathematical modelling; heat losses of building; heat balance of building; conductive convective and radiation heat losses; LBN 002-01; apportionment of heat losses and sources in building; HeatModHeat transfer coefficientFin (extended surface)Heat capacity rateEnvironment. Technology. Resources.
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