CO2 Insulation for Thermal Control of the Mars Science Laboratory

Bhandari, Pradeep; Karlmann, Paul; Anderson, Kevin R.; Novak, Keith

doi:10.2514/6.2011-5119

Cited by 6 publications

(12 citation statements)

References 8 publications

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“…The most similar experimental study was conducted by Bhandari et al [27]. In order to find the critical thickness for the cylinder enclosures of the Mars rover, they investigated natural convection in a horizontal CO 2 cylinder enclosure under low pressure of 1066 Pa and gravitational acceleration of 9.8 m/s 2 .…”

Section: Comparison and Validation With Experimentsmentioning

confidence: 99%

“…The physical property parameters of carbon dioxide were obtained from the National Institute of Standards and Technology (NIST) database [27,29]:…”

Section: Mathematical Formulation and Solution Methodsmentioning

confidence: 99%

“…The enclosure parameters were as follows: thickness range of 5 mm ≤ H ≤ 180 mm; temperature of the high-temperature surface of T h = 220 K, 230 K, 240 K, 250 K, 260 K, 270 K, 280 K; and temperature of the low-temperature surface of T c = 200 K and the rest of the surface of adiabatic wall. The gas in the enclosure was carbon dioxide, and the pressure was 1000 Pa [27]. The length of the enclosures in the normal direction of the xy plane was large enough so that a two-dimensional flow was assumed.…”

Section: Physical Modelmentioning

confidence: 99%

“…The temperature of the enclosure's upper surface was 200 K and the temperature of the surrounding and lower surface was 240 K. The heat transfer fluid, temperature, and pressure in their paper were all in accordance with the parameters on Mars' surface. The same horizontal cylinder enclosure that was used in that study [27] was selected for comparison purposes in this paper. The diameter of the cylinder was 368.3 mm, remaining constant, and the enclosure thickness was changed to be 38.1 mm, 50.8 mm, 76.2 mm, 101.6 mm, and 127 mm.…”

Section: Comparison and Validation With Experimentsmentioning

confidence: 99%

“…There were few studies, however, about heat transfer inside CO 2 enclosures under conditions similar to Mars' surface. In order to find the critical thickness corresponding to the minimum heat transfer for the cylinder enclosures of the Mars rover, Bhandari et al [27] conducted experimental and numerical studies on heat transfer in a cylindrical CO 2 enclosure The enclosure had five different thicknesses under working conditions with low pressure of 1066 Pa and gravitational acceleration of 9.8 m/s 2 . They found that the transition from thermal conduction to convection occurred at about H = 63.5 mm as the enclosure thickness increased.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study of Fluid Flow and Heat Transfer in Carbon Dioxide Enclosures on Mars

Sun

Lin

et al. 2018

Energies

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Abstract:In order to support the future thermal control and energy conservation design for the Mars rover, numerical studies on natural convection in CO 2 enclosures on Mars' surface were conducted for both horizontal and vertical enclosures. The parameters are as follows: the atmospheric pressure was 1000 Pa, the gravitational acceleration was 3.62 m/s 2 , and the Prandtl number was 0.77. The heat flux, temperature, and velocity fields of the CO 2 enclosures were obtained with the aspect ratio ranging from 5.56 to 200 and the Grashof number ranging from 430 to 2.6 × 10 4 . It was found that natural convection formed more easily in the horizontal enclosures than that in the vertical enclosures when the enclosures had same thickness. With the increasing thickness of the enclosures, Rayleigh-Bénard convections formed in the horizontal enclosures, while only single-cell convections formed in the vertical enclosures. The heat flux through the horizontal enclosures was greater than that through the vertical enclosures with the same thickness when natural convection formed. The maximum difference between them reached 35.26%, which was illustrated by the field synergy principle. A hysteresis phenomenon of the natural convection dominating the heat transfer was found in the vertical enclosure on Mars' surface. New values for the critical Grashof number and correlations for the average Nusselt number for both the horizontal and vertical CO 2 enclosures on Mars' surface were also developed.

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Section: Comparison and Validation With Experimentsmentioning

confidence: 99%

“…The physical property parameters of carbon dioxide were obtained from the National Institute of Standards and Technology (NIST) database [27,29]:…”

Section: Mathematical Formulation and Solution Methodsmentioning

confidence: 99%

Section: Physical Modelmentioning

confidence: 99%

Section: Comparison and Validation With Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Numerical Study of Fluid Flow and Heat Transfer in Carbon Dioxide Enclosures on Mars

Sun

Lin

et al. 2018

Energies

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Theoretical investigation of natural convection heat transfer in inclined and fully divided CO2 enclosures on Mars

Sun

Lin

et al. 2018

International Journal of Heat and Mass Transfer

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Thermal Insulators' Performances in Simulated Mars Environment

Scaccabarozzi¹,

Saggin²,

Tarabini

2013

Journal of Heat Transfer

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This paper describes the experimental characterization of the thermal insulation properties of a multilayer insulator (MLI) and of an aerogel. Materials characterization wasperformed to optimize the thermal control design of a small interferometer devoted to planetary observation. In order to simulate the Martian environment, tests were performed in a carbon dioxide atmosphere, with pressures between 10 and 10'' Pa and temperatures from 193 to 353 K. MU was tested at different levels of layers compression to investigate thermal insulation changes deriving from the constraining of the mechanical structure. The thermal conductivity was measured with a purposely designed guarded hot plate apparatus. Results showed that the aerogel exhibits a lower thermal conductivity for gas pressures larger than 100 Pa and that the layer compression of the MLIs does not affect the heat conduction for gas pressures above 10^ Pa.

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CO2 Insulation for Thermal Control of the Mars Science Laboratory

Cited by 6 publications

References 8 publications

A Numerical Study of Fluid Flow and Heat Transfer in Carbon Dioxide Enclosures on Mars

A Numerical Study of Fluid Flow and Heat Transfer in Carbon Dioxide Enclosures on Mars

Theoretical investigation of natural convection heat transfer in inclined and fully divided CO2 enclosures on Mars

Thermal Insulators' Performances in Simulated Mars Environment

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