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Title: Development of a wind retrieval method for low-speed low-pressure flows for ExoMars
Authors: Soria Salinas, Á.
Zorzano, María Paz
Mantas Nakhai, R.
Martín Torres, Javier
Keywords: Heat transfer coefficient;Forced convection;Wind tunnel;Nusselt number;Experiments;Mars
Issue Date: 5-Nov-2020
Publisher: Elsevier BV
DOI: 10.1016/j.applthermaleng.2020.115752
Published version:
Citation: Applied Thermal Engineering 180: 115752(2020)
Abstract: Forced convective heat transfer from three horizontally inclined rectangular-based cylinders (rods) has been studied experimentally under representative Martian near-surface air flows in the Aarhus Wind Tunnel Simulator (AWTS), Denmark. The testing campaign was developed for the HABIT (Habitability: Brines, Irradiation and Temperature) instrument, European payload on board the ExoMars 2022 Kazachok surface platform. The average heat transfer coefficient was determined from steady CO2 flows at a pressure of 9.9 mbar, an ambient temperature of ∼25 °C, and for horizontal free-stream velocities between 0.8 and 12 m/s. A retrieval algorithm to derive the wind speed from the average heat transfer coefficient estimated at each of the three HABIT Air Temperature Sensors (ATS) rods was calibrated within the AWTS. The ATS rods are placed one at the front of the instrument structure (ATS2) and two on the sides (ATS1 and ATS3); and under Martian atmospheric conditions these rods serve as cooling fins. Several relationships between the Nusselt number and the Reynolds and Prandtl numbers reported in the literature were evaluated to model convective heat transfer from the ATS rods. Where needed, corrections to account for radiative heat transfer within the AWTS were implemented. The final retrieval method demonstrated that wind speed can be retrieved for frontal winds in the range of 0–10 m/s, with an error of ±0.3 m/s, using the cooling profile of the ATS rod 3, and for lateral winds in the range of 0–6 m/s, with an error of ±0.3 m/s, using the ATS rod 2 cooling profile.
Description: Highlights A novel wind speed retrieval is developed for Mars surface exploration. Retrieval method based on forced convection modelling on passive-cooling fins. Free flow speeds measuring capabilities demonstrated for pressures  bar. Accuracy of ±0.3 m/s for frontal winds at  m/s and lateral winds at  m/s.
ISSN: 1359-4311
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