ディスポーザ排水中の卵殻の搬送特性と投入禁止によるユーザー便益への影響  [in Japanese] FLUIDITY OF EGGSHELLS IN HOUSEHOLD DISPOSER DRAINAGE AND INFLUENCE OF THE PRESENCE OF INAPPROPRIATE GARBAGE ON THE USER ACCEPTANCE  [in Japanese]

The fluidity of eggshell particles represented the inorganic heavy materials and vegetable particles represented the organic light materials in disposer drainage were examined. The necessary flow velocity to sweep out the precipitated particles in a 1/100 declined piping was measured as over 0.3m/s for eggshells and over O.lm/s for carrot. The flow velocity distribution was found to reduce in area of about 20cm upper part from a vent and the values declined under the necessary sweep out flow velocity for eggshells and which induced the selective precipitation of eggshells in the area. Questionnaire surveys for disposer users showed that the prohibition for eggshell to throw into a disposer was not reduce the user acceptance and willing to pay value.