Thermal conductivity of gases. III. Some values of thermal conductivities of argon, helium, and nitrogen from 0 C to 75 C at pressures of 1 x 10^5 to 2.5 x 10^7 pascals

Abstract

Acc urate meas ureme nts of th e t herm al co ndu c ti viti e.s of Ar an d He ag ree with th e th eor.e ti cal va lu e of 2.51>7)c,. (7) = viscos it y, c,. =s pec i/l c hea t ca pacit y a t co ns ta nt vo lum e 1> is a nu m~e r s hghtl y gre ate r th a n 1 de pe ndin g u po n th e inte rm olec ul ar pote nti a l). Me as u!·e m e nts of th e the r ma l co nd~c.ti viti es of N, at 9.6 a nd 75°C as a fu ncti on of press ure up to 2.53 X 10' Pa help to app raIse th e va lt d lt y of o th e r meas ure me nt s of th e th e rm al co nd uc ti viti es of de nse gases. T he excess co nd uctI VIt y of nItroge n (th e ad diti o na l co nd uc ti vity resu ltin g fro m press ure) is s hown to be a fun c ti o n of o nl y th e de ns ity of th e nitroge n fro m 0 to 700 °C a nd pre ss ures u p to 1.3 X 10 8 P a.... . Key wo rd s : Ex cess th e rma l co nd ucti vit y of N2; th e rm a l co ndu ctI VIt y of Ar; th e r ma l co nd uc ll vlt y of He; th e rm a l co nd uc ti vit y of N,.

Dissipative particle dynamics with energy conservation: Isoenergetic integration and transport properties

“…Figure 4a presents the dependence of heat conductivity κ on the average fluid temperature and density for the reference parameters, using a small value of J 0 τ r 2 c /(k B T 0 ) = 0.25. Thermal conductivity increases when average fluid density or temperature increase, which is qualitatively consistent with other experimental and theoretical investigations [67][68][69][70]. We will discuss these dependencies in more detail in Sec.…”

Gas Production from the Radiolysis of Water Adsorbed on ZnO Nanoparticles

“…In contrast, Ar has a similar thermal conductivity to O2, hence in this instance, He was selected as the carrier gas to increase O2 sensitivity. 24 GC calibration was performed for each gas by injecting known quantities of either pre-mixed 5% H2…”

“…There is a large difference in the thermal conductivities of H 2 and Ar; hence, Ar was used as the carrier gas in the detection H 2 . In contrast, Ar has a similar thermal conductivity to O 2 ; hence, in this instance, He was selected as the carrier gas to increase O 2 sensitivity …”

The production of reactive chlorine species (RCS) by argon and helium plasma jets and the sensitivity of liver cancer cell HepG2 to RCS and H2O2 treatment

“…[38,39] At a distance of 1 mm downstream from the tube nozzle, the temperature of the Ar/0.8% O 2 plasma jet was T g = 750 ± 50 K, and that of the He/0.8% O 2 plasma jet was T g = 520 ± 50 K. Considering the similar plasma power, the lower temperature in the case of He/0.8% O 2 plasma could be explained by the higher thermal conductivity of He. [40] An important factor in the formation of RCS is the production efficiency of O atoms and one mechanism is the dissociation of O 2 molecules by the impact with metastable state atoms. With increasing O 2 concentration, a rapid decrease in Ar metastable state atoms, Ar (1s 5 ) concentration, was observed: the concentration of Ar(1s 5 ) was ≈5 × 10 11 cm −3 in pure Ar, while the detection limit of the TDLAS system reached at 0.2% O 2 , [Ar(1s 5 )] ≈ 1 × 10 11 cm −3 (Figure S1).…”