Laminar Flow Elements for Flow Metering

T.V.MUHAMMED ASHARAF

LAMINAR FLOW ELEMENTS FOR FLOW METERING
FLOW TYPESLAMINAR (< Re - 2000)
STREAMLINES WILL PRESERVE THEIR CONFIGURATION UNCHANGED AT ALL INSTANCES AND WILL SHOW THE PATH OF INDIVUIDCUAL PARTICLES OF THE FLUID.
TURBULANT (> Re 4000)

Poiseuille Equation
The Poiseuille Equation quantifies the relationship between pressure drop and flow as: Q = (P1 - P2) r4 / 8LWhere:

Q = Volumetric Flow Rate
P1 = Static pressure at the inlet
P2 = Static pressure at the outlet
r = Hydraulic Radius of the restriction
= (eta) absolute viscosity of the fluid
L = Length of the restriction

LAMINAR FLOW ELEMENTS
Practically, you transform a large tube into a a number of small tubes and in those tubes in the right pressure and flow conditions, the flow will be laminar.

The advantage of a laminar flow is that the pressure drop across this flow element is directly proportional to the flow.So by measuring a tiny pressure drop with the right differential pressure sensor, we have a linear flow meter. Simple and repeatable if not clogged.

The laminar flowmeter is by design linear, so one calibration point is sufficient to recalibrate it properly.The laminar flowmeter is more resistant to contamination that heat exchange based flowmeters are having.

The laminar flowmeter is directional, it knows by principle which way the flow goes unlike heat exchange based flow measurementNo warm up time.

The larger the flow,the larger the laminar flow element has to be so it can become quite bulky. The flow measuring element is a repeatable assembly of precisely machined parts so it is expensive to manufacture.

The measurement of air or gas flow is sensitive to temperature variations. Temperature affects the volume of air,
temperature affects the gas viscosity,
The measurement creates a pressure drop so to be fast and accurate, you need to measure a very small differential pressure very accurately. It is expensive.

with compensation.
COMPENSATION FOR PRESSURETEMPERATUREVISCOSITY

LAMINAR FLOW ELEMENTS-USAGE AREA

LAMINAR FLOW ELEMENTS-USAGE AREA (Automotive)

LAMINAR FLOW ELEMENTS-USAGE AREA (Medical)

LAMINAR FLOW ELEMENTS-USAGE AREA (Appliances)

LAMINAR FLOW ELEMENTS-USAGE AREA (Packaging)

LAMINAR FLOW ELEMENTS-USAGE AREA (Valve)

LAMINAR FLOW ELEMENTS-USAGE AREA (Gas)

Commercial leaders in the FieldMERIAM, USA PATENTED DESIGNATEQ SYSTEMS, FRANCETELEDYNE HASTINGS

LAMINAR FLOW 7ELEMENTS- Commercial Models

LAMINAR FLOW ELEMENTS- Commercial Models

Manifold blocks used in medical ventilators produced by Blease, these incorporate a customised MDE Laminar Flow Element.

LAMINAR FLOW ELEMENTS- Commercial Models

Mimic breathing monitor designed and produced in association with Allan-Moore Electronics for Medic Aid Ltd a company producing drug delivery systems for the healthcare sector.


Automotive Leak Test

ing

Ball bearing

Bellows seal

Brake caliper

Brake pipes

Catalytic exhaust pipe

Clutch casting

Cylinder block

Cylinder head

Cylinder head

Cylinder sleeve

Delco

Differencial gear

transmission

Engine block

Engine rubber seals

Exhaust manifold

Exhaust pipe

Fu

el cap

Fuel filter

Fuel float

Fuel tank

Fuel tank cap

Gas tank

Gear box

Gear box manifold

Head light

Head light ramp

Heat exchanger

Heater core

High pressure fuel

circuit

Horn

Hydraulic transmission

Injection ramp

Inlet manifold

Inlet valve

Inlet valve gui

de seal

Jerrycan

Lip seal

Mecanical transmission

Oil manifold

Oil gauge

Oil heater

Petrol tank

Pneumatic jack

Pneumatic spring

Pneumatic transmission

Rocker arm cap

Rubber pipe

Shock absorber hydraulic tank

Shock absorber valve

Silencer

Single switch gauge

Speed controller

Spiral wound gasket for camshaft

Spiral wound gasket for crankshaft

Spiral wound gasket for cylinder

head

Spiral

-

wound gasket for engine

Steering wheel

Tank fuel circuit

Turbo compressor

Water circuit

Water float

Water pump

Leak & Flow & Volume Testing

Aerosol pump for pharmaceuticals

Aerosol valve for pharmaceuticals

Leak & Volume Testing

Syringe

Leak & Pressure Testing

Pressure switch

Thermal switch

Medical Leak Testing

Blisters

Cathet

ers

Condoms

Glass pharmaceutical bottle

Hydraulic connector

Plastic bag

Plastic pharmaceutical bottle

Pneumatic connectors

Spray can for pharmaceuticals

Surgeon glove

Water sweetener

Leak & Flow Testing

Dialysis equipment

Intravenous drip

Inhaler

Fine spra

y generator

lexible pipes

Plastic valve

Pressure regulator

Flow &

Electrical & Pressure Testing

Ventilator

Leak T

esting

Computer screen

Water sweetener for

caravans

Electrcal

Testing

Computer

Fan

Curling tongue

Flow & Electrical

Testing

Air dryer

Vacuum cleaner

Leak & Electrical

Testing

Coffee machine

Dish washer

Iron

Kettle

Light bulb

Television set

Leak & Flow & Multi

Testing

Refrigeration circuit

Flow Testing

Pen

Multi Testing

Boilers

Tumbul dryer

Fri

dge

Washing machine

Leak & Flow Testing

Fine spray generator

Leak & Volume Testing

Ink cartridges

Leak Testing

Aerosol pump

Aerosol valve

Complete aerosols

Deodorant stick

Plastic bag

Plastic bottle

Plastic cosmetic bo

ttle

Spray can

Glass cosmetic bottle

Leak Testing

Aluminum conn

ector

Float

Heater connector

Hydraulic connector

Hydraulic valve

Pneumatic connectors

Pneumatic jack

Pneumatic spring

Pneumatic transmission

Pneumatic valve

Pump connector

Regulation valve

Thermal valve

Thermalstatic valve

Leak & Pressure

Testing

Pressur

e contact switch

Pressure reducing valve

Pressure regulator

Pressure valve

Regulator

Solenoid

Thermal switch

Master cylinder

Leak & Flow & Pressure

Testing

Flexible pipes

Leak & Multi

Testing

Pressure switch

Multi Testing

Pressure

gauge

Leak Testing

Gas Meter

Heat exchanger

for boilers

Regulator

Leak & Flow

Testing

Ramp for boilers

Ramp for co

okers

Regulation valve

Tap/valve

Flow Testing

Burner

Injector

Lighter

Leak & Flow &

Electrical Testing

Cooker

Multi Testing

Boilers (sanitory

and central

heating circuits)

Laminar Flow Elements for Flow Metering

Documents

Transcript of Laminar Flow Elements for Flow Metering