Experimental and Theoretical Investigation of the Dry Ice Sublimation Temperature for Varying Far-Field Pressure and Co2 Concentration

Purandare, Abhishek; Verbruggen, Wim; Vanapalli, Srinivas

doi:10.2139/ssrn.4462700

Cited by 1 publication

(2 citation statements)

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“…In our experiment a temperature of -96.8 °C or 176.4 K is measured. This phenomenon has been systematically investigated in our recent study, which focuses on the heat and mass transport at the interface between a dry ice sphere and a controlled ambient environment in terms of pressure and CO2 concentration [6]. For this purpose, the dry ice sphere is suspended on a thin E-type thermocouple wire (calibrated) within a cross-shaped KF vacuum flange.…”

Section: Dry Ice Sublimation Temperaturementioning

confidence: 99%

“…The ambient surrounding the dry ice sphere is well-controlled by flushing the flange with a gaseous mixture of N2 and CO2, with a known concentration and pressure, as schematically shown in Figure 3 b). Further information on the experimental setup, as well as extensive experimental and theoretical results, can be found in [6]. Figure 3 a) presents the only relevant result for this paper, displaying the measured values of the sublimation temperature of a suspended dry ice sphere in an environment with one atmospheric pressure and varying CO2 concentrations.…”

Section: Dry Ice Sublimation Temperaturementioning

confidence: 99%

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A protocol for accurately calibrating thermocouples at cryogenic temperatures

Purandare,

Vanapalli

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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To study the quenching characteristics of materials in a cryogenic liquid bath transient temperature measurements of high accuracy are necessary. Thermocouple is an ideal tool for this application because of its low self-heat capacity. However, they require calibration before usage that require multiple fixed-point temperatures. The common fixed-point temperatures are the water-ice melting temperature, the dry ice sublimation temperature, and the boiling temperature of liquid nitrogen. It is important to note that there are uncertainties associated with dry ice sublimation and liquid nitrogen boiling temperature inherent to the heat and mass transport phenomenon at their phase-changing interface or inside the bulk medium. The dry ice temperature is influenced by the mass transport phenomenon occurring at the interface between the dry ice and the ambient surrounding it. In a typical lab environment, dry ice temperature is significantly lower than the commonly quoted sublimation temperature of -78.5 °C at 1.013 bar. In the case of liquid nitrogen stored in a cryostat, temperature gradients develop in the liquid bath. This paper describes a protocol for calibrating thermocouples by accurately defining and using fixed-point temperatures of dry ice in a saturated environment and a liquid nitrogen slush.

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Section: Dry Ice Sublimation Temperaturementioning

confidence: 99%

Section: Dry Ice Sublimation Temperaturementioning

confidence: 99%