Description of the project

Thermal management is a key enabler of hybrid propulsion and needs the introduction of innovative cooling technologies with enhanced performances and improved integration capabilities.

Pulsating Heat Pipe (PHP) is a promising solution to enable thermal management improvement for such applications.

Drawing on experimental prototype results, PHP is subject to academic studies in particular to well understanding its behaviour in order to create numerical modeling.

The aims of this project are:

  • to develop a PHP predesign tool including for instance:
    • multi source heat loss,
    • the PHP geometry,
    • the fluid properties,
    • transient calculations,
    • FMU/FMI format (allowing a link to Dymola for instance),
    • Dry out phenomena,
      and so on.
  • to lead tests campaign using as much as necessary PHP prototypes in order to:
    • calibrate the previous PHP predesign tool,
    • develop a PHP data base allowing to build thanks to a neuronal method a mathematical macro model of the PHP. To that purpose, an adaptative test bench shall be developped in order to characterize the PHP prototypes according to a design of experiment. This latter shall be built in taking into account the whole PHP parameters.

Both numerical and experimental studies shall be dealt with in concert.

Different tasks

Bibliography on numerical aspects

Pulsating Heat Pipes are nowadays well known for the performance in thermal management because of the advantageous combination they can offer: great heat transfer capacity for a very low cost of manufacturing.
But its thermo-fluidic behavior is not simple and many aspects of the internal heat and mass transfers remain unknown. Several numerical studies are developed over the world in order to clarify this aspect.
Bibliography  should focus on recent achievements on modelling aiming at representing the global behavior of the heat pipe. A detailed scientific background is expected concerning both single bubble and multi-bubble PHP bibliography. This study should finally be focused on predictive model advantages and drawbacks and therefore depict what could be possible and impossible concerning a dedicated numerical approach on this project.
A research regarding the PHP patents should complete this bibliography.

PHP modelling

The topic manager is willing to integrate such a heat transfer device to cool some of its equipment exposed to severe thermal and vibrating environments. For such critical systems, the topic manager needs simulation tools to help product designers to perform the right choice and therefore manufacture products with an interesting reliability.
A description of the topic manager constraints shall be delivered to the applicant in order to help bordering the interfaces and thermal domain of the pulsating heat pipe.

The model developed in this task shall be easy to implement so as to fulfill the following rules:

  • Numerical interfaces of the model shall be compatible with FMU/FMI norms for a further
    integration in a MODELICA system model;
  • A parametric model allowing the topic manager to perform integration trade-offs : geometrical, thermal and environmental parameters;
  • A switchable modelling time dependence from transient to steady state depending on the final use.

The applicant shall develop a simulation tool with a user interface to predict the PHP global parameters from its geometry and material properties. The simulation shall account for the interaction of multiple vapor bubbles inside the PHP including the effect of the liquid films of variable length inside the bubbles. The simulation shall be capable to predict the PHP functioning limits, in particular its dry out.

Validation demonstrators

In parallel to numerical developments, in order to update and validate the numerical predesign tool, the aplicant shall design and manufacture as much PHP demonstrators as necessary.

Validation tests campaigns

The demonstrators shall answer to criterions defined on previous task.

Adaptable tests bench development – design and manufacturing

Regarding the tests campaign, in order to create the PHP data base, the applicant shall design and develop an adaptable tests bench. This bench shall be interfaced with the whole PHP demonstrators developed in the following task.
The validity range of the PHP relevant parameters shall fit with the manager topic specification.

Heat pipe manufacturing and integration

The applicant shall design and develop as many PHP  demonstrators as necessary to perform a comprehensive study (cf. following task) highlighting its global performance depending on its relevant parameters.

Experimental study

The applicant shall build a Design of Experiment and follow it to characterize the thermal behavior of the heat pipe for the whole PHP relevant parameters. Tests campaign shall cover the entire validity ranges of each parameters based on the topic manager specification.

Mathematical macro model

The applicant shall develop thanks to the experimental results retrieved from the previous task a mathematical model describing the right thermal behaviour of a PHP in the framework of the topic manager specification.

CleanSky 2

This project is part of CleanSky 2 project.

For further information, you can go to the concerned website : http://www.cleansky.eu/