|
||
 |
Product Alerts
Keep current on the latest products, new suppliers, and technical articles of interest to you. (See Topics) |
Permanent Pressure Loss
By Rajaram K. Prabhudesai
|
From Chemical Engineering License Review, Second Edition
Permanent Pressure LossVenturi Permanent pressure loss through venturis depends upon the diameter ratio ? and the discharge cone angle ?. The pressure loss for smaller angles (5 to 7 ) is 10 to 15 percent of the total pressure differential ( P 1 ? P 2). It is 10 to 30 percent for large angles (> 15 ). Subsonic Flow Nozzles For subsonic flow nozzles, the pressure loss is given by  where ? is the nozzle throat diameter divided by the pipe diameter. Concentric Circular Nozzles In the case of the concentric circular nozzle,  Example 2-2 A venturimeter is to be installed in a schedule 40, 6-in line to measure the flow of water. The maximum rate is expected to be 800 gpm at 86 F. A 50-inHg manometer is to be used. Specify the throat diameter of the venturi and calculate the power required to operate it. The discharge cone angle is 5 . Solution. From Eq. (2-14),  C = 0.98 for venturis if N Re > 10,000 (i.e., fully turbulent flow). Assume fully turbulent flow. Then  where D P is the inside diameter of pipe, ft. Squaring both sides, one obtains  Simplifying and solving for D T gives  Use 2.375 in = 0.1979 ft (a standard size). Check the Reynolds number through the throat of the venturi.   This N Re is greater than 10,000 and therefore the flow is in the fully turbulent region. Therefore, the size of...
Copyright Engineering Press 1999 under license agreement with Books24x7
Products & Services
Flow transmitters provide electrical outputs that are proportional to flow inputs. They use flow meters to measure the flow of liquids and gases.
Search by Specification |
Learn more about Flow Transmitters
Air blow guns attach to air lines for the manual actuation and/or control of air discharge. They are used primarily for debris removal and purging, non-contact part cleaning and drying, and general laboratory or industrial applications.
Search by Specification |
Learn more about Air Blow Guns
Nozzles alter and control the stream or spray pattern of a fluid in a spray coating or dispensing system.
Search by Specification |
Learn more about Nozzles
Eductors have numerous uses in the plant such as lifting, pumping, mixing and agitation of liquids, granular solids and slurries.
Learn more about Eductors
Volumetric liquid flow switches measure the flow or quantity of a moving fluid in terms of a unit of volume per time, such as liters per minute. These flow sensing devices have a switch output.
Search by Specification |
Learn more about Volumetric Liquid Flow Switches
Product Announcements
Topics of Interest
Flow of Fluids in Pipes
The nature of the flow of a fluid in a pipe depends upon the Reynolds number which is defined as
where D
= inside diameter of pipe, ft
u
=...
(Read More)
Flow nozzles are similar to Venturi tubes, but the nozzle opening is an elliptical restriction in the flow. There is no outlet area for pressure recovery and pressure loss is comparable to an orifice...
(Read More)
Critical or sonic flow has a long historical background. However, substantial
use of critical flowmeters did not begin until the 1960s. Critical flowmetering had
acceptance first in the aerospace...
(Read More)
FRICTIONAL PRESSURE LOSSES
Frictional pressure losses inside the drill string are usually measured while frictional pressure losses in the annulus in conventional operations are usually ignored.
(Read More)
Designing the Collector The fluid emerging from the impeller is conducted to the
pump discharge port or entry to another stage by the collecting configuration, which can
employ one or more of...
(Read More)
|
|
