A theory of dropwise condensation at large subcooling including the effect of the sweeping

Download

index.pdf

Date

2002-02-01

Author

Yamali, C
Merte, H

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

208
views

0
downloads

The effect of sweeping by the departing droplets on the heat transfer coefficient in dropwise condensation is studied analytically here. Using basic principles, an analytical model for dropwise condensation is devised, which takes into account the elementary processes that make up the dropwise condensation cycle. The analysis is divided into two parts: in the first part, the heat transfer as a result of nucleation and coalescing of the droplets is considered. In the second part, the effect of sweeping is introduced. The results are presented as the variation of nondimensional heat flux versus the distance from the upper edge of the condenser surface at various surface subcoolings. Calculations show that the variation of heat flux with surface subcooling is linear only at small values of subcooling. As the subcooling is increased the slope of the mean heat flux versus subcooling curve decreases, and for a sufficiently high body force passes through a maximum.

Subject Keywords

General Engineering, Condensed Matter Physics, Fluid Flow and Transfer Processes

URI

https://hdl.handle.net/11511/65282

Journal

HEAT AND MASS TRANSFER

DOI

https://doi.org/10.1007/s002310100272

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

An experimental investigation on performance of annular fins on a horizontal cylinder in free convection heat transfer Yildiz, S; Yüncü, Hafit (Springer Science and Business Media LLC, 2004-02-01) Natural convection heat transfer in annular fin-arrays mounted on a horizontal cylinder was experimentally investigated. An experimental set-up was constructed to investigate heat transfer characteristics of 18 sets of annular fin-arrays mounted on a horizontal cylinder of 24.9-mm diameter in atmospheric conditions. Keeping the fin thickness fixed at 1 mm, fin diameter is varied from 35 mm to 125 mm and fin spacing is varied from 3.6 mm to 31.7 mm. The base-to-ambient temperature difference was also varied ...
Heat transfer effects on the stability of low speed plane Couette-Poiseuille flow Oezgen, Serkan; Dursunkaya, Zafer; Ebrinc, Ali Asian (Springer Science and Business Media LLC, 2007-10-01) The stability problem of low-speed plane Couette-Poiseuille flow of air under heat transfer effects is solved numerically using the linear stability theory. Stability equations obtained from two-dimensional equations of motion and their boundary conditions result in an eigenvalue problem that is solved using an efficient shoot-search technique. Variable fluid properties are accounted for both in the basic flow and the perturbation (stability) equations. A parametric study is performed in order to assess the...
Effects of optical design modifications on thermal performance of a highly reflective HfO2/SiO2/TiO2 three material coating OCAK, M.; Sert, Cüneyt; Okutucu-Ozyurt, T. (Springer Science and Business Media LLC, 2018-02-01) Effects of layer thickness modifications on laser induced temperature distribution inside three material, highly reflective thin film coatings are studied with numerical simulations. As a base design, a 21 layer coating composed of HfO2, SiO2 and TiO2 layers of quarter wave thickness is considered. First, the laser induced temperature distribution in this base design is obtained. Then the layer thicknesses of the base design are modified and the corresponding temperature distributions in four alternative no...
Ice accretion simulation on multi-element airfoils using extended Messinger model Özgen, Serkan (Springer Science and Business Media LLC, 2009-01-01) In the current article, the problem of in-flight ice accumulation on multi-element airfoils is studied numerically. The analysis starts with flow field computation using the Hess-Smith panel method. The second step is the calculation of droplet trajectories and droplet collection efficiencies. In the next step, convective heat transfer coefficient distributions around the airfoil elements are calculated using the Integral Boundary-Layer Method. The formulation accounts for the surface roughness due to ice a...
A numerical study of single-phase convective heat transfer in microtubes for slip flow Sun, Wei; Kakac, Sadik; Yazicioglu, Almila G. (2007-11-01) The steady-state convective heat transfer for laminar, two-dimensional, incompressible rarefied gas flow in the thermal entrance region of a tube under constant wall temperature, constant wall heat flux, and linear variation of wall temperature boundary conditions are investigated by the finite-volume finite difference scheme with slip flow and temperature jump conditions. Viscous heating is also included, and the solutions are compared with theoretical results where viscous heating has been neglected. For ...

Citation Formats

C. Yamali and H. Merte, “A theory of dropwise condensation at large subcooling including the effect of the sweeping,” HEAT AND MASS TRANSFER, pp. 191–202, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65282.