Abonnement à la biblothèque: Guest
Page d'accueil ICHMT DL Année en cours Archives Comité de direction Centre international pour le transfert de chaleur et de masse


DOI: 10.1615/ICHMT.2008.CHT.810
17 pages

Gintautas U. Miliauskas
Department of Thermal and Nuclear Energy, Kaunas University of Technology, Donelaicio 20, LT-44239 Kaunas, Lithuania

Stasys Sinkunas
Department of Thermal and Nuclear Energy, Kaunas University of Technology, Donelaicio 20, LT-44239 Kaunas, Lithuania


The change of thermal state and phase transformation intensity of sprayed liquid droplets is modeled according to the iterative method of numerical research under different boundary conditions of heat and mass transfer, when the influence of the Knudsen layer is neglected and warming and evaporation of the droplets has no influence on the state of the carrying air flow. The complex "droplet problem" covers the analysis of combined energy transfer in a semitransparent droplet, also combined heating and evaporation of the droplet. The interaction of unsteady heat and mass transfer processes is examined taking into account spectral absorption of radiation. Temperature of the interphase contact surface is determined, at which the balance of energy fluxes taken to the surface and taken from the surface is reached. The temperature mode of an evaporating droplet depends on the way of droplet heating manner as well. It was defined that heat transfer from a gas to a droplet in different manners, independently on the same primary conditions, the droplet reaches equilibrium evaporation state being in different energetic level. It is determined, that in the case of conductive heating during unsteady evaporation droplets reach a new isothermal state without reference to the initial water temperature and the size of droplets,. In the case of radiant - convective heating a droplet reaches its equilibrium evaporation mode being non-isothermal. The simplest way of energy supply to a liquid droplet is its conductive heating. The research results prove that a peculiar change of the thermal state of sprayed liquid exists in the time scale expressed by Fourier number, irrespective of droplet's dispersivity. The above discussed change can be conveniently defined by the characteristic curves representing the change of a droplet surface, centre, and mean mass temperatures, which are sensibly influenced by temperature of gas mixture and partial pressure of liquid vapour in it.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH