Added terms for reactor typ description

[HendrikBorgelt]

Added terms for reactor typ description.

These terms where added:

reactor type
plug flow reactor
stirred tank reactor
tubular reactor
coiled tubular reactor
continously stirred tank reactor
discontinous stirred tank reactor

[dalito]

Another concept in this family:

• Ideal reactor - An abstract concept for a reactor which can be exactly characterized by simplified model equations for mass, momentum and energy.

Regarding the submission:

• I suggest replacing "archetype" by "abstract concept". I could not find chem. eng. references where "archetype" was used in connection with reactor types.
• Please check your defs for typos
• Please don't repeat the preferred label of the concept in the definition text. This is to make the definition independent of the preferred label.

[dalito]

If the pref. label contains the term "plug", you can't use the same term as part of the definition.

[HendrikBorgelt]

is it acceptable if I have a short definition of "plug" after using it in the text? I don't really find a good alternative for plug and recommend synonyms also do not sound promising (bung, connection, cork, filling, fitting, occlusion, river, spigot, stopple, tampon, wedge; as can be found at https://www.thesaurus.com/browse/plug). Rephrasing everything so that I indirectly have the definition for plug inside the text might only make the definition and text unnecessarily difficult.