Application of numerical simulation in the design of wire-mesh mist eliminator
Previous design of wire-mesh mist eliminator relies on enormous experiments and consumes a lot. In this paper, its pressure drop is simulated by numerical simulation, and non-simplified three-dimensional calculation model is established. After calculated under the flow velocity of 3-10m/s and compared it with the experimental data, the results show that the numerical simulation result achieves a very high precision. Meanwhile, the influence of different wire diameter and space between wire-mesh layers on the pressure drop of mist eliminators is studied and the proper space between wire-mesh layers within the scope of wire-diameter is 0.6mm–0.8mm. Two types of model were verified through the model experiment and the experimental error is less than 4%, which can be a theoretical guidance for designing mesh filter.
Design of wire mesh mist eliminators
Knitted wire mesh mist eliminators are used extensively in many industrial plants. Their widespread application is essentially due to the low cost and efficient removal of entrained liquid droplets from vapor and gas streams. Despite the broad range of entrainment removal applications, open literature on this topic is limited. All the available design relations are based on semiempirical equations with an uncertain range of application. In this work, a set of new experimental data was obtained by investigating the performances of commercial eliminators, and a mechanistic model is presented. Comparison between experimental data and the proposed model shows that it can be used to predict separation efficiency both for horizontal and vertical arrangements.
Effects of reservoir volume on performance of pulse tube cooler.
A pulse tube cooler has the advantages of long-life and low-vibration over conventional cryocoolers such as G-M and Stirling coolers because of the absence of moving parts at low temperature. On the other hand, the combination of a reservoir and orifice is indispensable to optimize the performance of pulse tube coolers. In order to make the pulse tube cooler compact for practical applications, the volume of reservoir should be minimized. This paper analyzes the effects of the reservoir volume on the thermodynamic performance of various components in a simple orifice and a double-inlet pulse tube cooler by combining a linearized model with a thermodynamic analysis. Expressions of entropy production for those components are presented. The results show that the reservoir volume has a significant influence on the entropy production in the various components when the reservoir to pulse tube volume ratio is smaller than about 5. The ratio is important to determine the minimum reservoir volume for a pulse tube cooler. Optimum settings for a double-inlet pulse tube cooler are also discussed.