Доступ предоставлен для: Guest
Главная ICHMT DL Текущий год Архив Исполнительный Комитет ICHMT


DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.720
pages 965-978

Theresa Weith
University of Bayreuth Zentrum fur Energietechnik / Lehrstuhl fur Technische Thermodynamik und Transportprozesse 95447 Bayreuth, Germany

Florian Heberle
University of Bayreuth Zentrum fur Energietechnik / Lehrstuhl fur Technische Thermodynamik und Transportprozesse 95447 Bayreuth, Germany

Dieter Brüggemann
Lehrstuhl für Technische Thermodynamik und Transportprozesse (LTTT), Zentrum für Energietechnik (ZET), Universität Bayreuth, 95440 Bayreuth, Germany


The present work shows results of an experimental investigation of heat transfer coefficients during flow boiling of siloxanes and siloxane mixtures. The main part of the test rig consists in a horizontal, plain tube out of stainless steel (inner diameter: 10 mm, wall thickness: 1 mm, length: 5.04 m), which is electrically heated by the Joule effect. The fluids hexamethyldisiloxane (MM) and octamethyltrisiloxane (MDM) are investigated. Mixtures in steps of 20 weight-percent of these two components are considered. The effect of pressure (pr = 0.4, Ts = 198 °C/220 °C), heat flux density (q = 9.5 −15.5 kW/m2) and mass flux density (G = 100 − 300 kg/m2s) on heat transfer is analysed. Regarding MM, the heat transfer coefficient decreases as the vapour quality increases. The variation of mass flux density shows higher heat transfer coefficients when raising the mass flux. An increase in heat flux density as well as pressure leads to no explicit influence on heat transfer coefficients in the investigated range. The measured heat transfer coefficients of MDM are on average higher than those of MM due to differences in transport properties and flow regimes. For siloxane mixtures, the average heat transfer coefficients are below the ones of pure components. The correlation by Kandlikar for pure fluids as well as for fluid mixtures predicts the general trend of heat transfer coefficient with respect to vapour quality and mass flux density. However, the values are overestimated by the correlation.

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