Martín-Torres, Javier

Tomás Soria-Salinas, Álvaro

Zorzano-Mier, María Paz

English

Aberdeen University Research

Geophysical Research AbstractsVol. 18, EGU2016-3215, 2016EGU General Assembly 2016© Author(s) 2016. CC Attribution 3.0 License.Convective Heat Transfer at the Martian Boundary Layer, Measurementand ModelÁlvaro Tomás Soria-Salinas (1), María Paz Zorzano-Mier (1,2), Javier Martín-Torres (1,3)(1) Luleå University of Technology, Department of Computer Sciences, Electrical and Space Engineering, Division of SpaceTechnology, 98128 Kiruna, Sweden, (2) Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, 28850 Madrid, Spain, (3)Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), 18100 Granada, Spain.We present a measuring concept to measure the convective heat transfer coefficient h near a spacecraft operatingon the surface of Mars. This coefficient can be used to derive the speed of the wind and direction, and to detectits modulations. This measuring concept will be used in the instrument HABIT (HabitAbility: Brines, Irradianceand Temperature) for the Surface Platform of ExoMars 2018 (ESA-Roscosmos). The method is based on theuse of 3 Resistance Temperature Thermodetectors (RTD) that measure the temperature at 3 locations along theaxial direction of a rod of length L: at the base of the rod, Tb, an intermediate point x = L/n, TLn, and thetip,Ta. This sensing fin is called the Air Temperature Sensor (ATS). HABIT shall incorporate three ATS, orientedin perpendicular directions and thus exposed to wind in a different way. Solving these equations for each ATS,provides three fluid temperatures Tf as well as three m parameters that are used to derive three heat transfercoefficients h. This magnitude is dependent on the local forced convection and therefore is sensitive to the direction,speed and modulations of the wind. The m-parameter has already proven to be useful to investigate the convectiveactivity at the planetary boundary layer on Mars and to determine the height of the planetary boundary layer. Thismethod shall be presented here by: 1) Introducing the mathematical concepts for the retrieval of the m-parameter;2) performing ANSYS simulations of the fluid dynamics and the thermal environment around the ATS-rods underwind conditions in Mars; and 3) comparing the method by using data measurements from the Rover EnvironmentalMonitoring Station (REMS) at the Curiosity rover of NASA’s Mars Science Laboratory project currently operatingon Mars. The results shall be compared with the wind sensor measurements of three years of REMS operation onMars.

Convective Heat Transfer at the Martian Boundary Layer, Measurement and Model

https://aura.abdn.ac.uk/bitstream/2164/14052/1/SoriaSalinas_et_al_EGU2016_3215_VoR.pdf

Convective Heat Transfer at the Martian Boundary Layer, Measurement and Model

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