Oxidatively-heating process

Besides, it is self-evident, as stated in the preceding section, that the spatial distribution of temperature, in particular, in the early stages of the self-heating process, or of the oxidatively-heating process, in a small-scale chemical of the TD type, including every small-scale gas-permeable oxidatively-heating substance, subjected to either of the two kinds of adiabatic tests, is the very ultimate of the Semenov model, because the condition, the Biot number = Ur A = 0, holds strictly in such a chemical. 

The heater is able to heat the atmosphere in the jacket at the maximum heating rate of 20 K/min in order that, even if some oxidizing gas is supplied into the jacket at the maximum flow rate of 20 cm /min, the condition, A Tjijf= T - Tam = 0, may hold while the adiabatic control is performed for the oxidatively-heating process, in the early stages, of the substance. The other points are the same as those described in Subsection 4.2.2. 

Immediately after that, the supply of nitrogen gas into the draft cell is ceased, and the supply of air into the draft cell at a flow rate of 2 cm /min, the adiabatic control by means of the adiabatic self-heating process recorder and the record of the oxidatively-heating process, in the early stages, of 2 cm of the substance charged in the draft cell by means of the digital D.C. millivolt recorder are started, respectively. This point of time corresponds to the point s in Fig. 15 presented in Section 3.4. 

The time, A t, required for the temperature of 2 cm of the substance charged in the draft cell, into which air is supplied, and subjected to the adiabatic oxidatively-heating test started from a below about 180 °C to increase by the definite value of AToi 1.25 K from the corresponding standard temperature is determined on the linearly-rising part of the oxidatively-heating process or curve of the substance. 

On the other hand, however, the oxidatively-heating process, in the early stages, of 2 cm of the oil-soaked adsorbent cotton charged in the draft cell and subjected to the adiabatic oxidatively-heating test is recorded, as an analog signal as well, with the T pen on the strip chart of the two-pen strip chart recorder to look about the process as a whole. 

---