The latent heat transfer during vapour condensation in the condenser section of passive heat transport devices such as the two-phase closed thermosiphon is limited by film condensation. Dropwise condensation provides an increase of the heat transfer coefficient by up to one order of magnitude and can be achieved with a water-repellant surface. The inner surface of pipes made from stainless steel was functionalized by laser surface texturing with ultrashort laser pulses and subsequent storage in a liquid containing long-chained hydrocarbons. The pipes were separated into half-pipes by wire eroding to enable laser texturing of the inner surface, and were then joined by electron beam welding after laser texturing. As a result, superhydrophobic and water-repellent surfaces with a contact angle of 153° were obtained on the inner surface of the pipes with a length of up to 1 m. The functionalized pipes were used in the condenser section of a two-phase closed thermosiphon to demonstrate a heat transfer rate of 0.92 kW at 45 °C, which is approximately three times the heat transfer rate of 0.31 kW of a smooth reference pipe.
%0 Journal Article
%1 holder2024enhancing
%A Holder, Daniel
%A Peter, Alexander
%A Kirsch, Marc
%A Cáceres, Sergio
%A Weber, Rudolf
%A Onuseit, Volkher
%A Kulenovic, Rudi
%A Starflinger, Jörg
%A Graf, Thomas
%D 2024
%J Scientific Reports
%K myown peer
%N 2557
%R https://doi.org/10.1038/s41598-024-53062-8
%T Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes
%V 14
%X The latent heat transfer during vapour condensation in the condenser section of passive heat transport devices such as the two-phase closed thermosiphon is limited by film condensation. Dropwise condensation provides an increase of the heat transfer coefficient by up to one order of magnitude and can be achieved with a water-repellant surface. The inner surface of pipes made from stainless steel was functionalized by laser surface texturing with ultrashort laser pulses and subsequent storage in a liquid containing long-chained hydrocarbons. The pipes were separated into half-pipes by wire eroding to enable laser texturing of the inner surface, and were then joined by electron beam welding after laser texturing. As a result, superhydrophobic and water-repellent surfaces with a contact angle of 153° were obtained on the inner surface of the pipes with a length of up to 1 m. The functionalized pipes were used in the condenser section of a two-phase closed thermosiphon to demonstrate a heat transfer rate of 0.92 kW at 45 °C, which is approximately three times the heat transfer rate of 0.31 kW of a smooth reference pipe.
@article{holder2024enhancing,
abstract = {The latent heat transfer during vapour condensation in the condenser section of passive heat transport devices such as the two-phase closed thermosiphon is limited by film condensation. Dropwise condensation provides an increase of the heat transfer coefficient by up to one order of magnitude and can be achieved with a water-repellant surface. The inner surface of pipes made from stainless steel was functionalized by laser surface texturing with ultrashort laser pulses and subsequent storage in a liquid containing long-chained hydrocarbons. The pipes were separated into half-pipes by wire eroding to enable laser texturing of the inner surface, and were then joined by electron beam welding after laser texturing. As a result, superhydrophobic and water-repellent surfaces with a contact angle of 153° were obtained on the inner surface of the pipes with a length of up to 1 m. The functionalized pipes were used in the condenser section of a two-phase closed thermosiphon to demonstrate a heat transfer rate of 0.92 kW at 45 °C, which is approximately three times the heat transfer rate of 0.31 kW of a smooth reference pipe.},
added-at = {2024-01-31T08:29:24.000+0100},
author = {Holder, Daniel and Peter, Alexander and Kirsch, Marc and Cáceres, Sergio and Weber, Rudolf and Onuseit, Volkher and Kulenovic, Rudi and Starflinger, Jörg and Graf, Thomas},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2cc6e81e49f350503bd81f8bae9264cb0/danielholder},
doi = {https://doi.org/10.1038/s41598-024-53062-8},
interhash = {d0cfd7ae2cdb6f353883a8253edb8123},
intrahash = {cc6e81e49f350503bd81f8bae9264cb0},
journal = {Scientific Reports},
keywords = {myown peer},
number = 2557,
timestamp = {2024-05-14T16:20:40.000+0200},
title = {Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes},
volume = 14,
year = 2024
}
