Relaxation in pure and seeded supersonic jets of SF6

Chakraborti, P. K. ; Talukdar, R. ; Bajaj, P. N. ; Joshi, A. ; Kartha, V. B. (1985) Relaxation in pure and seeded supersonic jets of SF6 Chemical Physics, 95 (1). pp. 145-155. ISSN 0301-0104

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Nozzle expansion of pure SF6 and SF6 seeded in carrier gases e.g. Ar, He and N2, is used to study relaxation of the various degrees of freedom. The diode laser absorption spectrum of the Q branch of the ν3 mode of SF6 is used to derive the rotational temperature (Trot). Time-of-flight studies determine the translational temperature (Ttg) while the vibrational temperature (Tvib) is estimated from the energy balance equation. Rotational and translational temperatures follow each other closely while the vibrational temperature lags behind considerably. The effective specific heat ratio (γ) and the collisional effectiveness parameter (e) for SF6 are determined from these measurements. Seeded-beam data prove argon to be a better refrigerant than He or N2. Cooling in seeded beams at moderate stagnation pressures is not substantially enhanced even at very high dilution.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:17817
Deposited On:16 Nov 2010 12:39
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