Suction Definition and 61 Threads

Does anyone know if it is possible to build a vacuum that move bean like material from one spot to another without damaging the beans? From talking with others, I would need something that would create negative air pressure for the suction but at the same time create positive air pressure to...

I'm looking for means of calculating load carrying capacity of a vertically mounted suction cup. Suction Cup effective diameter = 90mm Mounted on a vertical glass surface Pressure inside the suction cup = 0.75bar Pressure difference = 0.25bar Weight is suspended from a rod attached in the centre...

Good day I am trying to use a venturi across a centrifugal pump. The pressure at suction side is about 2 bar and the discharge pressure about 6 to 7 bar. This pump supply drippers and the delivery is about 180 cub/h. I need to inject entrainment air into the suction side and try to use a...

At a total loss here

Hey guys, we've been tasked with providing solutions for reducing coolant consumption by our client using automation. One of those is a system to reclaim the coolant dripped off of the chips from a Chip Trolley in a CNC Machine. Around 15-20 Litres of coolant+water emulsion is wasted everyday...

I am working on a design project where a shop-vac vacuum will be used to gather kevlar fibers in place for a cut to be made. Currently, the vacuum has a 1.25" diameter attachment. I have created a 0.25" diameter attachment that completes the task perfectly. However, I cannot figure out how to...

Currently there is an operation scenario at one of our plant which directly injecting steam into cooling water line at pump suction in order to generate hot water at 60 deg C for circulation, by doing this its generate vapor at pump suction and lead to cavitation which ultimately damage pump and...

Summary: Vacuum pump help I need advice on what type of vacuum pump would create max negative pressure in a very small area ( a space no larger than your pinky finger I guess) ? Maybe some kinda high suction low cfm pump? I don't know enough about vacuum pumps to know which type to...

In Chapter 40 (titled Typical Operating Conditions) of my textbook Refrigeration and Air-Conditioning Technology, the authors list several different objectives for readers at the beginning of the chapter. One of the stated objectives is for the reader to be able to describe how humidity affects...

Hi All, We all have experiences of using vacuum cleaner to clean carpet, floor, etc. and might probably have noticed a super intuitive phenomenon that as you move your vacuum cleaner suction hose closer to the floor, the suction force increases which helps you pull some of large trash off the...

The actual problem I am trying to understand is the suction requirement to move #2 home heating fuel from the outdoor tank to the pump of the burner located in my cellar. But first i just want to understand the movement of fluid in a vertical pipe without worrying about viscosity or...

Hello all, as my final project to attain my bachelors, I have tasked myself with designing some sort of device to collect insects from the canopy of soybean plants that can be suspended under a UAS (quad copter/drone). What I am trying to do is essentially build some sort suction device. The...

Hey, everyone I just bought an air purifier yesterday (the Honeywell 50250 model) and have a question about whether or not it's normal what is happening when I turn it on. I followed the instructions exactly in terms of assembly (it was really only putting on the pre-filter - no other assembly...

Sorry if I didn't post this at the right place. Hi all, I have a problem that I am not able to solve. I hope you guys can help me! I am creating a suction cup to grab and lift an object with a flexible surface made of out silicone The suction cup is also made out of some sort of flexible...

Hello, Im designing a product which will pump components as vacuum cleaner does. I have 2 questions: Im trying to calculate the pressure different in order to pump those metal component with : M=0.2 kg , dimensions (mm) cylinder with diameter 5.5 mm length 600mm . the formula for pressure...

Hello! Do ALL the pumps create suction cavitation (ie bubbles of vacuum inside the water)? Or it is a rare phenomenon? And does it increase with pump speed? thanks!

As I was going through a course on Hydraulics, there was a brief explanation about how the atmospheric pressure can only support a water column of 10.3 m.A few more points that are prerequisite to the discussion are as follows 1)A fluid cannot be pulled;it has to be pushed. 2)A centrifugal...

Consider a closed system (central heating). Before the pump is started the static pressure is 2.0 bars. Say the system head loss is 0.6 bars. When the pump starts, will the suction side pressure and the discharge pressure each read half the total head loss (1.7 and 2.3 bars)? Or will the head...

I am looking to calculate the area around the engine where, if an object enters this area, it would be "ingested" by the engine (subsonic flight). In other words, I am looking to draw the shape around the engine, where the air within that shape is disturbed air (being ingested by the engine)...

Head psa(suction surface pressure) = 2.31xP/specific gravity This is one of the factors to calc NPSH. Shows how much head is pushing liquid through the pump. What does the specific gravity have to do with surface pressure of a liquid before it goes into the pump? Isn't it just involving the...

Hi, I am wondering if suction power from a vacuum for example that has a set amount of power, is increased or decreased depending on the size of pipe. Does a large pipe decease/ increase the suction power, or does a small pipe decease/ increase the suction power? Is there a link to the size in...

Hi All, How to find vacuum created or suction created when we use peristaltic pump?

Hello, I have a general problem. I have a tank sitting at elevation of 63 feet. With 24 inch pipe to 1400 feet away from the facility. The facility is sitting at 59 feet. To get to our vertical can pumps suction we need to run the pipe up 7 feet for 150 feet of 12 inch pipe and then drop down...

I want to make a simple air filter(for dust and air pollution) but was a bit confused about some stuff. Basically I've decided to use an exhaust fan to create a vacuum in a sealed box and the air to come in through the filters. Box fans aren't available here, so that can't be used. I want to...

I need help with figuring out how to devise an equation that I'm going to plug into an algorithm for my software. These are the components: CO2 cartridge pressure regulator output should be around 200 psi. Tank #1 has a volume of 800 mL, pressure is around 15 psi. There are no valves between...

If I a pump with a main suction header and 4 smaller branch connections of difference sizes. Let's say for this example we have (2) 3", (1) 1", and (1) 2". Also let's say our pump is requiring 20 gal/min. The flow rate of each branch would be proportional to the area of the pipe correct? flow =...

I have a question about the following scenario involving a flow separation issue in a pipe expansion The angle of the expansion is 30* - doubling the diameter from 1D to 2D We can consider this flow fully developed with a Reynolds of 5000+ Associated with this expansion is a head loss...

Does it affect my aspiration power if I use a needle (beveled tip) Vs. straight tip Having a bevel increases the cross sectional area of the cylinder

Homework Statement Hi, I'm a junior doctor. It's been so long since I had physics! I've question about tube that's placed in chest cavity to drain air/fluid/etc. The second bottle, is under-water seal bottle. I know that its purpose is to prevent air moving TO the patient. but how? The "trap...

Hi, I've been considering the design of a fan that sucks air radially and blows axially to resolve a technical problem of a machine. I've looked around for the equations governing the air particles and the angle of the radial blades (angle between a flat blade and a radial line) of the fans, but...

I am curious as to whether a nozzle at the end of a pipe that is completely submerged in water and has a pressurized flow being pumped through it in a closed condition can increase the amount of flow and pressure of the water in a pipe fixed to the exit side of that nozzle if the nozzle uses the...

I am a little confused about how to construct a force diagram for a suction cup, like a plunger, as it is stuck to a wall. First, I know that the cup is not accelerating, so the gravitational force pulling down on the cup has to be met with an equal but opposite force vector pointing up...

Hello engineers, I am struggling with this seemingly simple problem and I was hoping to get some directions. Please look at the attached figure. I have a small chamber with a tube (radius=3mm) that is connected to a vacuum pump. The pump operates at -600 mmHg. The chamber is filled with air at...

Hi physicists! I am scratching my head to remember the most basic laws of fluid flow while I try to irrigate things from a barrel. Not exactly rocket science, I know ;-) But very exciting for me ... The situation is simply a pump (cheap submersible one) put into a barrel (sitting on the...

Simple (I hope) pump question. With the pump not even running, would like to know what my static NPSHa is if I had a flooded pump suction with 10 feet suction head of water and a vacuum of 27" Hg above the water? Basically it is the hotwell from a condensing turbine exhaust after the steam...

I've been trying calculate the capacity of one of our dust collection systems. It features four vacuum slots lined up (27 inches by 1 inch each) shown as #3 on the diagram attached. Using a manometer, I took pressure measurements at points #1 and #2. Both were around 1.1 inwc, which...

I am doing a study to see whether suction force can act as a mechanism to compress air. Let's say I have a normal syringe, which consist of the small cylindrical tip at the top of syringes where you attach the needle. Then there is the larger middle barrel for the liquid, medication, etc. Lastly...

I've recently been put in- charge of reviving a Fume Suction System installed at the electroplating section of factory. After my stint in the army my engineering skills leave a lot to be desired, even though i am a Mechanical Engineer (by education not profession) so it is my request to PFers to...

Homework Statement We set up in a lab a vertical pointing air jet giving a constant output and gradually increased the height of the plate above the jet whilst measuring the force upon it as imparted by the jet using a Newton-metre. At a big distance the air jet was imparting an upthrust on...

My understanding of suction is that it is a phenomenon describing the flow of fluid from a (relatively) high pressure volume into a (relatively) low pressure volume. This makes sense to me, as I grasp that air pressure is a measurement that describes a large number of molecules, each with its...

Homework Statement How massive an object can be supported by a 5.6 -diameter suction cup mounted on a vertical wall, if the coefficient of friction between cup and wall is 0.65? Assume normal atmospheric pressure. Homework Equations - The Attempt at a Solution I calculated the maximum...

Hey guys, I am currently trying to figure out how to build a really small vacuum system and trying to maximize the suction force. I understand that in order to create the vacuum suction force we must have a pressure drop within the chamber so the molecules rush into the low pressure region...

A PUMP OF 0.25HP IS CONNECTED IN THE ABOVE FASHION (REF ATTACHMENT) TO THREE TANKS BY MEANS OF A SINGLE SUCTION PIPE. THE SINGLE SUCTION PIPE IS FURTHER BRANCHED TO THREE SUCTION PIPES, ONE EACH FOR THREE TANKS. THE DESIGN DISCHARGE CAPACITY OF THE PUMP IS APPROXIMATELY 45 LIT/MIN. BUT...

Hi - am looking for some data points on how much suction is required to lift an object at different weights and volumes. Especially interested in any data relative to displacing an object caught in the throat if you are choking. Appreciate any help!

I am writing a report for my civil engineering subject. and i have few questions. is there any relationship between angle of repose and total soil suction. is there any relationship between angle of repose and particle size distribution. is there any relationship between angle of repose and...

Hi all, I want to know if impeller diameter of a Blower can influence its suction pipe length. If so, then how are they related?

Dear all, Take my best wishes. I am facing a problem designing my experimental setup for my research. I want to produce flow separation over a flat plate. Here is my experimental setup: Diffuser angle is 16deg. I need some documentation/text book regarding the effect of suction flow rate...

Hi, I had a question regarding pressure and suction. Say you have 2 walls with a suction cup that is attached to each. Initial volume of the cup is 1m^3, area attached is 1m^2 Initial pressure is 1 atm Both walls have a hole of different sizes with a pipe leading out to atmosphere. 1 pipe...

Hi everyone! I am not sure if I am posting in right place, please correct me if needed. I have an interesting project in my mind. And I need some help as I do not know how to implement it. I need 400 suction cups and all of them have to be working independently. Cups are supposed to be...

This is something that came up at work, as there are four computers running with their air vents placed four to six inches away from the air suction (so that it would suck up the air which was blown out from the air vent fan of a PC.) While this may seem like a good idea on paper (as the suction...