Original Paper (in Japaese)

Efficiency and Water Saving Effect of Rinsing with Air-Water Two-Phase Flow for Stainless Steel Pipelines

Satoshi OMORI1, Sumitoshi IMAMICHI2, Susumu SHINTANI3, Masami MATSUNAGA2, Tomoaki HAGIWARA1, Manabu WATANABE1, Hisahiko WATANABE1, and Takaharu SAKIYAMA1,†

1Department of Food Science and Technology, Tokyo University of Marine Science and Technology
2Food Sanitary Engineering Association
3Izumi Kosyo Co. Ltd.

Full Text


   Cleaning-in-place (CIP) of food processing equipment usually requires a huge amount of water. For reduction of water required in its final rinsing step, performance of air-water two-phase flow as a rinsing medium was studied. Horizontal and vertical straight pipes of 23 mm inner diameter were artificially soiled with millet jelly and rinsed with air-water two-phase flow at flow rates of 400, 600, and 800 L/min for air and 2, 3, and 4 L/min for water. At the lowest flow rate of air, the two-phase flow was not completely annular and rinsing efficiency was quite low. At higher air flow rates, however, the two-phase flow was shown to save about 90% of rinsing water with no or slight extension of rinsing time, compared with water flow rinsing at 40 L/min. For non-straight piping parts (tees, elbows, and a diaphragm valve), the air-water two-phase flow was shown to save about 80% of rinsing water but to take twice as much rinsing time as 40 L/min water flow.

Keywords: cleaning-in-place, rinsing, annular two-phase flow, water consumption, pipeline