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... 1 Projective Objective
The objective of this project is to compile a literature survey on typical needle valve geometries and available characteristic data for flow in such geometries and to create Computational Fluid Dynamic (CFD) models to simulate and predict characteristics of needle valve flows. ... At least two needle valve configurations to simulate flow in needle valves. ... 3 Methodology
The proposed programme to complete this project started off with literature survey to find out information and data of needle valves. ... flow coefficients and needle valve geometry) was found through manufacturers on the internet. Detailed information about flow characteristics and equations were from books (see reference). ... 0 Description of Needle Valves and Flow Characteristics
2.1 Needle Valves
By definition, valves are mechanical devices specifically designed to direct, start, stop, mix, or regulate the flow, pressure, or temperature of a process fluid. Valves can be designed to either liquid or gas applications. ...
Needle valves have a slender, tapered point at the end of the valve stem that is lowered through the seat to restrict or block flow. ... These small valves are widely used to accurately regulate the flow of liquids and gases at low flow rates. The fine threading of the stem and the large seat area allow for precise resistance to flow. Needle valves are also used in situations where the flow must be gradually brought to a halt and at other points where precise adjustments of flow are necessary or where a small flow rate is desired. They can be used as both on/off valves and for throttling service. [2]
In this project flow in a needle valve is to be investigated. The needle valve to be modelled is 64mm in length and weighs approximately 0. ... The needle valve is part of the control valve category, control valves are the most common valves because of their accuracy. They regulate the flow anywhere from a full-open to full-closed orifice. ... 2 Investigation of Flow Characteristics in Needle Valves
The measurement commonly used on valves is the valve coefficient ( ) or flow coefficient. When selecting or designing a valve for a specific application the valve coefficient is used to determine the size and the most efficient flow rate passing through it. ... It will also cause higher pressure drops and faster flow velocities which result in cavitations, flashing or erosion of the trim parts.
Approximate Word count = 1861
Approximate Pages = 7.4
(250 words per page double spaced)
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