Online measurement of water flow rate in a plant stem by heat flux control method.
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概要
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A system for on-line and real time measurement of water flow rate in a plant stem was developed on the basis of stem heat balance simplified by the heat flux control. Heat (<I>Q</I>) supplied from a main heater attached to the stem surface is diffused through heat flux (<I>q<SUB>f</SUB></I>) by water flow in the stem, heat flux (<I>q<SUB>s</SUB></I>) from the surface of the main heater to the surroundings, and upward and downward heat fluxes (<I>q<SUB>u</SUB></I> and<I>q<SUB>d</SUB></I>) by conduction in the stem, that is, <I>Q=q<SUB>f</SUB>+q<SUB>s</SUB>+q<SUB>u</SUB>+q<SUB>d</SUB></I>. In this system, <I>q<SUB>s</SUB></I>was kept constant by controlling <I>Q</I>, and<I>q<SUB>u</SUB></I>and<I>q<SUB>d</SUB></I>were also kept constant by controlling two subheaters attached to upside and downside of the main heater. Thus, change in the<I>Q</I>directly related to fluctuation of<I>q<SUB>f</SUB></I>. So, water flow rate in the stem was able to be calculated from the theoretical equation (Eq. (5) ) by using<I>Q</I>and temperature difference (<I>T<SUB>u</SUB>-T<SUB>d</SUB></I>) in the stem between upside and down-side of the main heater. We proposed to call this system "Heat Flux Control method (HFC method) ." From dynamic and static characteristics of the system in a glass tube used as the stem model and in an intact plant, it was estimated that HFC method can be used as a reliable tool for quantitative analysis of water flow in the stem and applied to researches on water process in the plant.
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