English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Spin casting of dilute solutions: Vertical composition profile during hydrodynamic-evaporative film thinning

Karpitschka, S., Weber, C., & Riegler, H. (2015). Spin casting of dilute solutions: Vertical composition profile during hydrodynamic-evaporative film thinning. Chemical Engineering Science, 129, 243-248. doi:10.1016/j.ces.2015.01.028.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Karpitschka, Stefan1, Author           
Weber, C., Author
Riegler, H., Author
Affiliations:
1Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2466703              

Content

show
hide
Free keywords: -
 Abstract: We analyze the vertical composition profile during hydrodynamic-evaporative film thinning (spin casting) of mixtures of non-volatile solutes and volatile solvents. We present a generic approach based on ideal solution behavior. Our analysis complements more detailed (but more system specific) studies that are available in the literature. The hydrodynamic-evaporative film thinning is described analytically based on the solvent properties. We find a universal film thinning behavior as a function of the rotation speed, viscosity and evaporation rate. The thinning process is uniquely characterized by its transition height i.e., the film thickness where hydrodynamics and evaporation contribute equally to film thinning. The theoretically predicted film thinning is in agreement with experimental results. The evolution of the internal film composition is calculated numerically. The numerical description is tractable and offers quantitative insights into the influence of the experimental conditions on the evolution of the internal composition. A characteristic Sherwood Number is introduced as a fundamental process parameter. It characterizes the vertical solution profile and serves as a well-defined and experimentally accessible criterion for the regimes of quantitative validity of our analysis. We also present new power laws, which link the process control parameters to the composition evolution, process duration, and final solute coverage. Because the analysis is generic and tractable, it also yields valuable insights for solutions behaving non-ideally.

Details

show
hide
Language(s): eng - English
 Dates: 2015-02-182015
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.ces.2015.01.028
BibTex Citekey: Karpitschka:ChemEngSci15
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Chemical Engineering Science
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 129 Sequence Number: - Start / End Page: 243 - 248 Identifier: ISSN: 0009-2509
CoNE: https://pure.mpg.de/cone/journals/resource/954925389239