Multistage dry vacuum pump.

Vacuum Gauge to Vacuum Pump Valve

CFD Simulation of a Dry Scroll Vacuum Pump Including Leakage Flows

One challenge for the numerical simulation of a dry scroll vacuum pump is the discretization of the chamber volume, which changes with time. In addition, the flow characteristics are very complex including the leakage flow caused by radial and axial gaps between the rotors and the housing. For engineers and designers it is imperative to understand the influence of such leakage flows on the effi...

A Case Study of Autoregressive Modelling and Order Selection for a Dry Vacuum Pump

Oil-free dry-vacuum pumps are prevalent in semiconductor plants worldwide today. The popularity of such pumps has grown over the years but little research has been done in the area of condition-monitoring of dry-vacuum pumps. Fault detection of one such pump through the use of AutoRegressive (AR) modelling technique and spectral analysis of vibration and acoustic data has been studied. The test...

Multistage vacuum membrane distillation (MSVMD) systems for high salinity applications

Multistage membrane distillation (MD) systems can have significantly higher efficiencies than their single stage counterparts. However, multistage MD system design has received limited attention. In this paper, the performance of a multistage vacuum membrane distillation (MSVMD) which is thermodynamically similar to a multi-stage flash distillation (MSF) is evaluated for desalination, brine con...

Multistage heat pump drying of macadamia nut under modified atmosphere

Multistage heat pump drying of macadamia nut under modified atmosphere was studied to improve the drying process and quality of the nuts. Conditions of study included drying temperature of 40-60°C, using nitrogen and normal air as drying medium. Drying kinetics and quality of nuts (moisture content, aw, rancidity and colour) as well as energy consumption of all drying processes were examined. T...