TU Darmstadt / ULB / TUbiblio

Evaporation and residue formation of dimethyl carbonate droplets on hot walls

Schumacher, Olaf ; Sielaff, Axel ; Stephan, Peter (2023)
Evaporation and residue formation of dimethyl carbonate droplets on hot walls.
17th International Heat Transfer Conference. Cape Town, South Africa (14.-18.08.2023)
doi: 10.1615/ihtc17.130-10
Conference or Workshop Item, Bibliographie

Abstract

When fuel is injected into a combustion chamber, spray impingement regularly results in the formation of liquid wall films. These films can have a long lifetime and contribute negatively to the emissions of the process. It is therefore of interest to investigate and, if possible, improve the evaporation behavior of these films. The evaporation and residue formation process is also influenced by previous events and the corresponding state of the wall surface. Therefore, in this work, a large number of individual droplets of dimethyl carbonate (DMC) are deposited one after the other on a hot plate with variable surface temperature. The droplets then evaporate under controlled boundary conditions. Both the droplet geometry with high temporal resolution and the mass of any residues formed are recorded. At wall temperatures below or at the saturation temperature of DMC, residues remain on the surface after the droplets have evaporated. As the number of droplets increases, the mass of residue increases as well, but approaches an upper limit as the test series progresses. The highest mass of residue is measured when the surface temperature is equal to the saturation temperature. Below the saturation temperature, the residues mix with the subsequent droplets to form a multicomponent fluid with different volatilities. As a result, the evaporation time of the individual droplets is prolonged, since diffusion of the volatile component to the liquid-gas interface is limited. Residues that form at the saturation temperature do not appear to be miscible with subsequent DMC droplets and do not affect the evaporation rate. The results indicate that when studying the evaporation behavior of films on hot walls, and their influence on coupled processes, the history of the wetted surface must also be considered.

Item Type: Conference or Workshop Item
Erschienen: 2023
Creators: Schumacher, Olaf ; Sielaff, Axel ; Stephan, Peter
Type of entry: Bibliographie
Title: Evaporation and residue formation of dimethyl carbonate droplets on hot walls
Language: English
Date: 2023
Place of Publication: Cape Town, South Africa
Collation: 10 Seiten
Event Title: 17th International Heat Transfer Conference
Event Location: Cape Town, South Africa
Event Dates: 14.-18.08.2023
DOI: 10.1615/ihtc17.130-10
Abstract:

When fuel is injected into a combustion chamber, spray impingement regularly results in the formation of liquid wall films. These films can have a long lifetime and contribute negatively to the emissions of the process. It is therefore of interest to investigate and, if possible, improve the evaporation behavior of these films. The evaporation and residue formation process is also influenced by previous events and the corresponding state of the wall surface. Therefore, in this work, a large number of individual droplets of dimethyl carbonate (DMC) are deposited one after the other on a hot plate with variable surface temperature. The droplets then evaporate under controlled boundary conditions. Both the droplet geometry with high temporal resolution and the mass of any residues formed are recorded. At wall temperatures below or at the saturation temperature of DMC, residues remain on the surface after the droplets have evaporated. As the number of droplets increases, the mass of residue increases as well, but approaches an upper limit as the test series progresses. The highest mass of residue is measured when the surface temperature is equal to the saturation temperature. Below the saturation temperature, the residues mix with the subsequent droplets to form a multicomponent fluid with different volatilities. As a result, the evaporation time of the individual droplets is prolonged, since diffusion of the volatile component to the liquid-gas interface is limited. Residues that form at the saturation temperature do not appear to be miscible with subsequent DMC droplets and do not affect the evaporation rate. The results indicate that when studying the evaporation behavior of films on hot walls, and their influence on coupled processes, the history of the wetted surface must also be considered.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Transregios
DFG-Collaborative Research Centres (incl. Transregio) > Transregios > TRR 150 Turbulent chemisch reagierende Mehrphasenströmungen in Wandnähe
Date Deposited: 27 Nov 2023 09:38
Last Modified: 27 Nov 2023 09:38
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details