<abstract xmlns="http://www.w3.org/1999/xhtml"><p> We consider heat rectification in radial flows of turbulent helium II, where heat flux is not described by Fourier's law, but by a more general law. This is different from previous analyses of heat rectification, based on such law. In our simplified analysis we show that the coupling between heat flux and the gradient of vortex line density plays a decisive role in such rectification. Such rectification will be low at low and high values of the heat rate, but it may exhibit a very high value at an intermediate value of the heat rate. In particular, for a given range of values for the incoming heat ow, the outgoing heat flow corresponding to the exchange of internal and external temperatures would be very small. This would imply difficulties in heat removal in a given range of temperature gradients.</p></abstract>

We consider heat rectification in radial flows of turbulent helium II, where heat flux is not described by Fourier's law, but by a more general law. This is different from previous analyses of heat rectification, based on such law. In our simplified analysis we show that the coupling between heat flux and the gradient of vortex line density plays a decisive role in such rectification. Such rectification will be low at low and high values of the heat rate, but it may exhibit a very high value at an intermediate value of the heat rate. In particular, for a given range of values for the incoming heat ow, the outgoing heat flow corresponding to the exchange of internal and external temperatures would be very small. This would imply difficulties in heat removal in a given range of temperature gradients.

Heat rectification in He II counterflow in radial geometries

Communications in Applied and Industrial Mathematics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Heat rectification in He II counterflow in radial geometries"}

We consider heat rectification in radial flows of turbulent helium II, where heat flux is not described by Fourier's law, but by a more general law. This is...

Heat rectification in He II counterflow in radial geometries

Pubblicato online: 05 dic 2018

Pagine: 141 - 148

Ricevuto: 12 gen 2017

Accettato: 12 nov 2018

DOI: https://doi.org/10.2478/caim-2018-0017

Parole chiave
Heat rectification, Superfluid helium, Radial heat flux, Quantum turbulence

© 2018 Lidia Saluto, et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Heat rectification in He II counterflow in radial geometries

Pubblicato online: 05 dic 2018

Pagine: 141 - 148

Ricevuto: 12 gen 2017

Accettato: 12 nov 2018

DOI: https://doi.org/10.2478/caim-2018-0017

Parole chiaveHeat rectification, Superfluid helium, Radial heat flux, Quantum turbulence

© 2018 Lidia Saluto, et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Parole chiave
Heat rectification, Superfluid helium, Radial heat flux, Quantum turbulence