An experimental investigation of the capsule velocity, concentration rate and the spacing between the capsules for spherical capsule train flow in a horizontal circular pipe

Abstract This is the first experimental study on capsule train flow conducted with spherical polypropylene capsules simulating spherical ice capsules in district cooling systems. This article explains experimental determination of the capsule velocity, capsule concentration rates (Cdyn. and Cst.) and the spacing between capsules for the flow of spherical capsule train in a horizontal straight pipe with water. The capsules are fabricated from polypropylene with density close to that of ice. The inner diameter (I.D.) and the length of the Plexiglass pipes constituting the test section, are 0.1 m and 6 m respectively and the diameter of the capsule is 0.08 m. Depending on the bulk velocity (Vm), the capsule velocity (Vc) and the spacing between capsules (lc) within a concentration range (Cdyn.) of 5–30% for 2.5 × 104