Air-liquid Two-phase Flow Simulation And Empirical Studies On Mine Return Air Spraying Heat Exchangers

In order to find the influencing factors and principles on thermal performanceof mine return air spraying heat exchanger (MRASHE), pressure&pressure drop ofmine return air (MRA), and the drift loss rate of drift eliminator (DE), theoreticalmodel of drops heat transfer rate indicating change in drops temperature when returnair and water contact directly was developed based on the overall heat transfer ratemodel and general heat transfer model. Computer fluid dynamics (CFD) simulationsoftware package FLUENT was employed to simulate two-phase flow of MRA andwater droplets in3D space. The influencing principles of thermal performance ofMRASHE by7factors were summed up. These factors include: drop diameter, returnair velocity, spraying height, spraying direction, nozzle number, nozzle mass flow rate,difference in initial temperature between water droplets and MRA, and theinfluencing principles of pressure&pressure drop of MRA, and drift loss rate of DEby several factors of return air velocity, angle between blades of plane DE (PDE) andthe horizontal plane, blades spacing of PDE, blades radius of arc DE (ADE), bladesspacing and height of snake-type DE (SDE), and V-type DE (VDE). Finally, thesimulation results have been experimentally verified.