A study of laminar forced film condensation of vapor flowing in cross-flow direction through the annular space between two concentric cylinders

Download

index.pdf

Date

2006

Author

Atılgan, Ahmet Koray

Metadata

Show full item record

Item Usage Stats

260
views

77
downloads

In this study laminar forced film condensation of vapor flowing in cross-flow direction through the annular space between two concentric cylinders was investigated numerically. To achieve this, governing equations of the vapor and the condensate flow in cross-flow direction between two concentric cylinders were developed. After obtaining the equations in integral forms by using the finite difference technique the vapor boundary layer thicknesses on the inner and outer cylinders and the condensate layer thickness was obtained as a function of the angular position on the cylinders. It was assumed that the condensation took place on the outer surface of the inner cylinder only and the outer cylinder was assumed to be insulated. The computer program developed is capable to calculate the condensate film thickness, vapor boundary layer thickness, the heat flux and the heat transfer coefficient and the interface velocity between the condensate and the vapor layer as a function of the angular position on the cylinders. Effects of changing the free stream velocity flowing in the channel, the radius of the inner cylinder, the temperature difference between the saturated vapor and the wall and the annular space between the concentric cylinders were investigated numerically by using the computer program and the results were presented graphically. Results showed that by increasing the free stream velocity of the vapor in the core, the film thickness decreased and by increasing the radius of the inner cylinder, the temperature difference between the saturated vapor and the wall and the annular space, the film thickness increased.

Subject Keywords

Energy Conservation.

URI

http://etd.lib.metu.edu.tr/upload/12607714/index.pdf
https://hdl.handle.net/11511/15951

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Experimental investigation of R134a flow in a 1.65 mm copper minitube Tekin, Bilgehan; Güvenç Yazıcıoğlu, Almıla; Kakaç, S.; Department of Mechanical Engineering (2011) This thesis investigates the refrigerant (R-134a) flow in a minitube experimentally. The small scale heat transfer is a relatively new research area and has been in favor since the end of 1970’s. Refrigerant flow in mini- and microscale media is a potential enhancement factor for refrigeration technology in the future. For the forthcoming developments and progresses, experimental studies are invaluable in terms of having an insight and contributing to the establishment of infrastructure in the field in addi...
A Numerical Simulation of non-uniform Magnetic Field Effect on Ferrofluid Flow in a Half-Annulus Enclosure with Sinusoidal Hot Wall Oglakkaya, F. S.; Bozkaya, Canan (2016-09-25) In this study, the problem of two-dimensional, laminar ferrofluid flow in a semi-annulus enclosure with sinusoidal hot wall is investigated numerically by using the dual reciprocity boundary element method. The flow is under the influence of a nodal magnetic source placed below the mid of the sinusoidal inner wall. The equations governing the present problem are obtained under the principles of ferrohydrodynamics and magnetohydrodynamics. The numerical computations are performed for various values of Raylei...
Finite element study of biomagnetic fluid flow in a symmetrically stenosed channel Turk, O.; Tezer, Münevver; Bozkaya, Canan (Elsevier BV, 2014-03-15) The two-dimensional unsteady, laminar flow of a viscous, Newtonian, incompressible and electrically conducting biofluid in a channel with a stenosis, under the influence of a spatially varying magnetic field, is considered. The mathematical modeling of the problem results in a coupled nonlinear system of equations and is given in stream function-vorticity-temperature formulation for the numerical treatment. These equations together with their appropriate boundary conditions are solved iteratively using the ...
A phase-field model for fracture of unidirectional fiber-reinforced polymer matrix composites Denli, Funda Aksu; Gultekin, Osman; Holzapfel, Gerhard A.; Dal, Hüsnü (Springer Science and Business Media LLC, 2020-04-01) This study presents a crack phase-field approach for anisotropic continua to model, in particular, fracture of fiber-reinforced matrix composites. Starting with the variational formulation of the multi-field problem of fracture in terms of the deformation and the crack phase fields, the governing equations feature the evolution of the anisotropic crack phase-field and the balance of linear momentum, presented for finite and small strains. A recently proposed energy-based anisotropic failure criterion is inc...
The boundary element solution of the magnetohydrodynamic flow in an infinite region Tezer, Münevver; Bozkaya, Canan (Elsevier BV, 2009-03-15) We consider the magnetohydrodynamic (MHD) flow which is laminar, steady and incompressible, of a viscous and electrically conducting fluid on the half plane (y >= 0). The boundary y = 0 is partly insulated and partly perfectly conducting. An external circuit is connected so that current enters the fluid at discontinuity points through external circuits and moves up on the plane. The flow is driven by the interaction of imposed electric currents and a uniform, transverse magnetic field applied perpendicular ...

Citation Formats

A. K. Atılgan, “A study of laminar forced film condensation of vapor flowing in cross-flow direction through the annular space between two concentric cylinders,” M.S. - Master of Science, Middle East Technical University, 2006.