Measurement of the Diffusion Coefficients of Organic Vapor into Air by the Stefan Method(1st Report Measurement on the Diethyl Ether - Air System at 303K)

Matsunaga Naoki, Aswad bin Mohd Rozin Mohd Syafiq

doi:10.2963/jjtp.29.90

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Other Title

Stefan法による有機化合物蒸気の空気に対する拡散係数の測定（第一報ジエチルエーテル-空気系の303Kにおける測定）
Stefanホウニヨルユウキカゴウブツジョウキノクウキニタイスルカクサンケイスウノソクテイ(ダイイチポウ)ジエチルエーテル : クウキケイノ 303K ニオケルソクテイ

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Abstract

An apparatus for the measurement of gaseous diffusion coefficients D by the Stefan method was developed and the diffusion coefficient of diethyl ether vapor into dry air was measured at 303.15 K (30 °C)and at atmospheric pressure, using a Pyrex evaporation tube (inner diameter 4×10^-³ m). The diffusion path lengths L (≃ 80, 120, 160×10^-³ m) and the air flow rates Q (0.8-83×10^-⁶ m³s^-¹ (50-5000 cm³min^-¹)) were systematically changed. A loose polyester cotton plug was inserted into the horizontal tubing (inner diameter 8×10^-³ m) just upstream of the mouth of the evaporation tube to straighten air flow and the results were compared with those obtained without the cotton plug. The use of the cotton plug reduced scatter in the experimental data and the air flow rate Q suitable to the measurement increased significantly from 3-16×10^-⁶ m³s^-¹ (200-1000 cm³min^-¹) to 10-33×10^-⁶ m³s^-¹ (600-2000 cm³min^-¹). At L ≃ 80×10^-³ m, the measurement could be done reasonably only with the cotton plug. The present experimental value (D = 0.093×10^-⁴ m²s^-1) agrees well with the extrapolation of our experimental data obtained by the Taylor dispersion method to lower temperature.

Journal

Netsu Bussei

Netsu Bussei 29 (2), 90-96, 2015

JAPAN SOCIETY OF THERMOPHYSICAL PROPERTIES

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