Franziska Hild

University of Stuttgart · Institute of Space Systems

Due to limited possibilities of experimental investigations for non-equilibrium gas flows, numerical results are of highest interest. Although the well-established Direct Simulation Monte Carlo (DSMC) method achieves highly accurate solutions, the computational requirements increase excessively for lower Knudsen regimes. Computationally more effici...

Challenging space missions at very low altitudes face significant atmospheric drag, requiring efficient propulsion such as Atmosphere-Breathing Electric Propulsion (ABEP) to extend mission lifetime. ABEP captures atmospheric particles, using them as propellant for an electric thruster, reducing dependence on limited on-board propellant and could ex...

The numerical simulation of multi-scale problems and non-equilibrium gas flows is of highest interest as experimental investigations are extremely complicated or impossible. Using the well-established Direct Simulation Monte Carlo (DSMC) method, a highly accurate solution of these flows can be achieved. However, simulations are accompanied by exces...

To achieve a feasible lifetime of several years, most satellites are deployed in orbits higher than 400 km. Drag of residual atmosphere causes a slow orbit decay, resulting in the deorbit of the spacecraft. However, e.g. optical instruments or communication devices would significantly benefit from lower altitudes in the range of 150-250 km. A solut...

The implementation of the ellipsoidal statistical Bhatnagar-Gross-Krook (ESBGK) method in the open-source particle code PICLas is extended for multi-species modeling of polyatomic molecules, including internal energies with multiple vibrational degrees of freedom. For this, the models of Mathiaud, Mieussens, Pfeiffer, and Brull are combined. In ord...

The numerical simulation of multi-scale problems and non-equilibrium gas flows is of highest interest as experimental investigations are extremely complicated or impossible. Using the well-established Direct Simulation Monte Carlo (DSMC) method, a highly accurate solution of these flows can be achieved. However, simulations are accompanied by exces...

To achieve a feasible lifetime of several years, most satellites are deployed in orbits higher than 400 km. Drag of residual atmosphere causes a slow orbit decay, resulting in the deorbit of the spacecraft. However, e.g. optical instruments or communication devices would significantly benefit from lower altitudes in the range of 150-250 km. A solut...

The utilisation of the Very Low Earth Orbit (VLEO) region offers significant application specific, technological, operational, and cost benefits. However, attaining sustained and economically viable VLEO flight is challenging, primarily due to the significant, barely predictable and dynamically changing drag caused by the residual atmosphere, which...

The operation of satellites in very low altitudes has significant technical and cost benefits. However, the main problem is the non-negligible aerodynamic drag force which leads to a rapid deterioration of satellite orbits if no adequate means of compensation is available. Passively, the lifetime of the spacecraft can be increased by a reduction in...

The utilisation of the Very Low Earth Orbit (VLEO) region offers significant application specific, technological, operational, and cost benefits. However, attaining sustained and economically viable VLEO flight is challenging, primarily due to the significant, barely predictable and dynamically changing drag caused by the residual atmosphere, which...

Operating satellites in very low altitudes has significant technical and cost benefits. However, the aerodynamic drag force causes a fast rate of orbit decay. In the scope of this thesis, various options for reducing the atmospheric forces acting on satellites in the Very Low Earth Orbits are analysed and evaluated with the aim to design satellite...

A concept design of a novel orbit control system is presented. It is based on the acceleration and subsequent ejection of magnetofluid droplets. Overall, the Gauss gun principle is investigated and extended on the utilisation of ferrofluids. Based on results of the student experiment PAPELL (Pump Application Using Pulsed Electromagnets for Liquid r...

Pump Application using Pulsed Electromagnets for Liquid reLocation (PAPELL) was a fast-paced student experiment conducted on the International Space Station (ISS). The 1.5 U flight hardware was integrated internally in an experiment rack of the educational company DreamUp and was executed for over 60 days in total during a half-year stay on the ISS...

This thesis discusses the concept design of a novel orbit control system based on magnetofluids as well as a respective performance estimation. Based on the principles studied by the student experiment PAPELL (Pump Application using Pulsed Electromagnets for Liquid reLocation), this spin-off application is investigated and developed.

PAPELL is a technology demonstration experiment that has been conducted on the ISS. It utilizes magnetic fields and a magnetisable liquid-ferrofluid and is a non-mechanical actuator. This principle can be exploited to move individual ferrofluid droplets, air bubbles and solids within dedicated experiment areas to demonstrate the capabilities, poten...

PAPELL is a technology demonstration experiment that has been conducted on the ISS. It utilizes magnetic fields and a magnetisable liquid-ferrofluid and is a non-mechanical actuator. This principle can be exploited to move individual ferrofluid droplets, air bubbles and solids within dedicated experiment areas to demonstrate the capabilities, poten...

This poster details the principles behind the PAPELL experiment on the ISS and focuses on the potential of this technology with respect to sustainable development.

On June 29 th 2018 the student experiment PAPELL (Pump Application using Pulsed Electromagnets for Liquid reLocation) was launched as part of the commercial resupply mission CRS-15 on a Dragon vehicle to the International Space Station. During the "Uberflieger" competition, organized by the German Aerospace Center (DLR), three proposed student expe...

PAPELL ("Pump Application using Pulsed Electromagnets for Liquid reLocation") is a technology demonstration of a non-mechanical pumping mechanism currently in operation aboard the ISS. The teamwork of more than 30 students of the Small Satellite Student Society KSat e.V. with the support of the Institute of Space Systems of the University of Stuttg...

This paper elaborates on the principles behind and potential applications of the PAPELL experiment that is operated on the International Space Station. The "Pump Application using Pulsed Electromagnets for Liquid reLocation" experiment is a technology demonstrator for a non-mechanic pumping mechanism, based on ferrofluid and electromagnets. A ferro...

Presentation of the conference paper: https://www.researchgate.net/publication/327860393_PAPELL_SOLID-STATE_PUMPING_MECHANISM

A basic outline of the Pump Application using Pulsed Electromagnets for Liquid reLocation (PAPELL) experiment flight hardware is given. Basic functionality, experiment plans, mission boundary conditions and organization is described.

In this paper the experiments conducted, prototypes developed and mechanical engineering undertaken during the student project "Pump Application using pulsed electromagnets for liquid reLocation" (PAPELL) are depicted, with special consideration to the related education aspects.

This Paper will detail educational aspects as well as communication, leadership and bureaucratic challenges encountered during the development of the ISS experiment PAPELL, which is an acronym for "Pump Application using Pulsed Electromagnets for Liquid reLocation". The experiment is a student project conducted mainly by members of the Small Satell...

Motivating the next generation of space explorers is one important task of a space agency. In order to maintain a skillful workforce in the field of aerospace engineering and related natural sciences, it is essential to get in contact with young people of all ages and to show them what the fields of Science, Technology, Engineering and Mathematics...