Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.v2.i5.50
pages 455-468

HEAT TRANSFER IN THIN LIQUID FILMS FLOWING DOWN HEATED INCLINED GROOVED PLATES

Hongyi Yu
Darmstadt University of Technology
Karsten Loffler
Chair of Technical Thermodynamics, Darmstadt University of Technology, Petersenstr. 30, 64287 Darmstadt, Germany
Tatiana Gambaryan-Roisman
Technische Universität Darmstadt
Peter Stephan
Institute for Technical Thermodynamics, Technische Universität Darmstadt, 64287 Darmstadt, Germany

ABSTRAKT

Thin liquid films flowing down vertical or inclined plates are widely used in many industrial apparatuses. Using structured plate surfaces often leads to heat transfer enhancement. In the present work, a numerical model for heat transfer in a thin liquid film flowing down a heated, inclined, and grooved plate is developed. To this end, the Graetz-Nusselt problem for falling films on structured plates is solved. The computed velocity field and the developed temperature field, as well as the temperature distribution in the thermal entrance region of a falling film, are presented. The dependence of the temperature distribution on the Reynolds number, Biot number, applied heat flux, plate inclination angle, and plate topography is investigated. It is shown that the film rupture on the groove crests, which is observed in experiments at relatively high heat fluxes, can be attributed to the strong interface temperature gradients developing in the thermal entrance region. To qualitatively validate the numerical model, the hydrodynamics and heat transfer in falling films on structured plates are studied experimentally and simulated using the CFD tool FLUENT. The numerical results of the Graetz-Nusselt problem are discussed and compared with the experimental values and results of the FLUENT simulations.


Articles with similar content:

HEAT TRANSFER IN THIN LIQUID FILMS FLOWING DOWN HEATED INCLINED GROOVED PLATES
ICHMT DIGITAL LIBRARY ONLINE, Vol.13, 2008, issue
Tatiana Gambaryan-Roisman, Karsten Loffler, Peter Stephan, Hongyi Yu
HEAT TRANSFER AUGMENTATION AROUND A DOWNWARD-FACING FLAT PLATE BY NON-UNIFORM ELECTRIC FIELDS
International Heat Transfer Conference 6, Vol.3, 1978, issue
Yasuo Mori, A. Yabe, Kunio Hijikata
NUMERICAL THERMAL AND FLUID FLOW TRANSPORT PHENOMENON OF RAYLEIGH-BENARD CONVECTION IN A THIN LIQUID LAYER
Journal of Flow Visualization and Image Processing, Vol.6, 1999, issue 1
Wen-Jei Yang
Enhancement of heat and mass transfer by waves on falling liquid film
International Heat Transfer Conference 12, Vol.20, 2002, issue
Takehiro Nosoko , Akio Miyara, Takashi Nagata
MARANGONI EFFECT ON THE LONGITUDINAL ROLLS OF A MIXED CONVECTION FLOW IN A HORIZONTAL OPEN CHANNEL
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2012, issue
L. Bammou, Yves Le Guer, Brahim Benhamou, Kamal El Omari, Serge Blancher