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HWAHAK KONGHAK,
Vol.30, No.1, 70-79, 1992
Vol.30, No.1, 70-79, 1992
입상체의 압축이론식에 관한 연구
The Study on the Theoretical Compression Equatiion of the Flocculated Granules
Mohr의 응력원을 이용하여 입상체의 압추특성해석에 적합한 이론식을 유도하였는데, 고분자 결합제로 피복-응집된 입상체를 압축하는 경우 입상체의 점탄성 특성에 의해 bulk wolum에서 granule volume까지 압축되는 동안에는 힘이 거의 소요되지 않음이 확인되었고, 따라서 실질적인 압축의 시작점을 granule volume으로 간주하여 유도한 입상체 압축이론식은 다음과 같다.
Cg=1- V/Vg = CmbP/1+bP
여기서 Cg는 입상체 축용도, P는 시료에 가해진 압력, V는 압력 P를 가했을 때의 시료부피, Vg는 granule volume, Cm과 b는 상수이다. 압축이론식과 실제의 실험결과는 서로 잘 일치하였고, 압축이론식의 상수 Cm과 granule porosity는 같은 값으로 나타났다.
Cg=1- V/Vg = CmbP/1+bP
여기서 Cg는 입상체 축용도, P는 시료에 가해진 압력, V는 압력 P를 가했을 때의 시료부피, Vg는 granule volume, Cm과 b는 상수이다. 압축이론식과 실제의 실험결과는 서로 잘 일치하였고, 압축이론식의 상수 Cm과 granule porosity는 같은 값으로 나타났다.
Using Mohr’s stree circle, a theoretical compression equation was derived which closely fit the compression stage of the granular bed. a new concept was conceived for the polymer bonded granule that when compressed during initial compression stage from bulk to granule volume negligible energy was consumed. This phenomenon was largely due to the viscoelastic behavior of the granule. Considering the granule volume as the real starting point of the bed compression, the following theoretical compression equa-tion was derived;
Cg=1-V/Vg=CmbP/1+bP
where, Cg is degree of volume reduction from granule volume, P is pressure, V is Volume, Vg is granule volume, Cm and b are constants. The experimental results and the results from theoretical compression equation showed good agreement over the whole range of experimental condition and the compression con-stant Cm was found to be the same value as granule porosity.
where, Cg is degree of volume reduction from granule volume, P is pressure, V is Volume, Vg is granule volume, Cm and b are constants. The experimental results and the results from theoretical compression equation showed good agreement over the whole range of experimental condition and the compression con-stant Cm was found to be the same value as granule porosity.
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