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Condensate flow inside paper dryer cylinders

Wilhelmsson, BI; McKibben, JF; Stenström, Stig LU and Aidun, CK (1995) In Journal of Pulp and Paper Science 21(1). p.1-9
Abstract
The rimming flow of condensate in horizontal rotating dryer cylinders has been studied computationally by solving the full Navier-Stokes equations coupled with a volume of fluid method for tracking the free surface. It was shown that significant variations in both condensate velocity and thickness exist at moderate dryer speeds, whereas at higher speeds the variations are of less significance. Regardless of dryer speed or condensate film thickness, the film can be divided into two distinct regions: a viscous sub-layer adjacent to the cylinder wall and an inviscid, oscillating layer close to the free surface. The thickness of the viscous layer decreases as the dryer speed increases, whereas, for a certain speed, it is independent of the... (More)
The rimming flow of condensate in horizontal rotating dryer cylinders has been studied computationally by solving the full Navier-Stokes equations coupled with a volume of fluid method for tracking the free surface. It was shown that significant variations in both condensate velocity and thickness exist at moderate dryer speeds, whereas at higher speeds the variations are of less significance. Regardless of dryer speed or condensate film thickness, the film can be divided into two distinct regions: a viscous sub-layer adjacent to the cylinder wall and an inviscid, oscillating layer close to the free surface. The thickness of the viscous layer decreases as the dryer speed increases, whereas, for a certain speed, it is independent of the total film thickness. The computational results are compared with measurements of both the film thickness and the pressure normal to the cylinder wall. In both cases the agreement is excellent. Some implications for heat transfer through the condensate film are briefly discussed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
HORIZONTAL DESIGN, DRUM DRIERS, CONDENSATES, CONDENSATE REMOVAL SYSTEMS, FLOW, THICKNESS, LAYERS, VELOCITY, VARIATIONS, EQUATIONS, HEAT TRANSFER
in
Journal of Pulp and Paper Science
volume
21
issue
1
pages
1 - 9
publisher
TAPPI
external identifiers
  • wos:A1995QC34800001
  • scopus:0029184830
ISSN
0826-6220
language
English
LU publication?
yes
id
f6c14568-c0df-46d2-bb93-badd86a1c3b5 (old id 3914084)
date added to LUP
2013-07-01 11:07:14
date last changed
2017-01-01 07:21:27
@article{f6c14568-c0df-46d2-bb93-badd86a1c3b5,
  abstract     = {The rimming flow of condensate in horizontal rotating dryer cylinders has been studied computationally by solving the full Navier-Stokes equations coupled with a volume of fluid method for tracking the free surface. It was shown that significant variations in both condensate velocity and thickness exist at moderate dryer speeds, whereas at higher speeds the variations are of less significance. Regardless of dryer speed or condensate film thickness, the film can be divided into two distinct regions: a viscous sub-layer adjacent to the cylinder wall and an inviscid, oscillating layer close to the free surface. The thickness of the viscous layer decreases as the dryer speed increases, whereas, for a certain speed, it is independent of the total film thickness. The computational results are compared with measurements of both the film thickness and the pressure normal to the cylinder wall. In both cases the agreement is excellent. Some implications for heat transfer through the condensate film are briefly discussed.},
  author       = {Wilhelmsson, BI and McKibben, JF and Stenström, Stig and Aidun, CK},
  issn         = {0826-6220},
  keyword      = {HORIZONTAL DESIGN,DRUM DRIERS,CONDENSATES,CONDENSATE REMOVAL SYSTEMS,FLOW,THICKNESS,LAYERS,VELOCITY,VARIATIONS,EQUATIONS,HEAT TRANSFER},
  language     = {eng},
  number       = {1},
  pages        = {1--9},
  publisher    = {TAPPI},
  series       = {Journal of Pulp and Paper Science},
  title        = {Condensate flow inside paper dryer cylinders},
  volume       = {21},
  year         = {1995},
}