Pump Definition and 655 Threads

Hi, I'm wondering if a vacuum pump outlet air could be used as a blower? I have a small open-type wind tunnel that have been used with the vacuum pump by sucking the surrounding air. Could I use the outlet air from the pump to work as a blow-down wind tunnel? Thanks

I found this water pump (or so I think) that I'm trying to learn more about. I'm not exactly sure how it's intended to work, but I tested it in a way that works: The tube that comes out of the main part at an angle seems to be the input, where air is forced down the tube. Once the air reaches...

I read in the Britannica Encyclopedia yesterday that Rene Descartes rejected the idea that a water pump works because nature abhors a vacuum, and instead said that it works "by the weight of the water which counterbalances that of the air". I have an idea of the two contrary concepts opposed...

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...

Hi all, I am designing an artificial rain system and was thinking about using http://www.dannermfg.com/Store/Products/Danner/PID-02720.aspx to power it. The goal of the system is to deliver roughly 1 gallon of water per hour to each of the 8 exit points (I will measure this by using a bucket...

I need to deliver air up to 5 meters high. I am thinking of using pump since I can find easily (no buying anything). Is it possible to deliver air using hydraulic centrifugal pump ?

Hello For my study I'm making a specific design I'm trying to design a ballast chamber which i want to empty with a venturi pump I attached a schematic image of the idea Through pipe A a liquid is pumped with around 150m3/h through a 6'' pipe. The pipe is narrowed at the end, with a space...

Hello I need to build a pump to transfer alumina filled polyester resin. Can I use something like this - http://www.ebay.co.uk/itm/1Pcs-KSC50x100-50mm-Bore-100mm-Stroke-Double-Action-Pneumatic-Air-Cylinder-/350908339995?hash=item51b3c4571b ? One to use resin pumping, other for moving the resin...

Homework Statement I'm not too sure about my attempt to this question, but what is the simplified Steady Flow Energy Equation for a water pump that has one inlet at the bottom and one outlet at the top, and a work input? Homework Equations Q^ = W^ + m^[(h2 - h1) + 1/2 (c22 - c12) + g(z1 - z2)]...

The old tumble drier is past its use-by date and it is time to get a new one. The old one vents through a pipe to the outside and the new one will be a condensing type. I really can't think that they are efficient devices (efficiency in the loose sense, of course) as they seem to use the...

Homework Statement Hi, How come, for a refrigerator and a heat pump, we don't consider the changes in energy for the refrigerant for when the pressure drops (at expansion valve) and when it rises (at the compression valve)? We only consider the changes in energy when it evaporates and...

Does diameter reduction on the pressure side shortly after the pump induces overexertion of the impeller? This is the setup: suction line: 8" - length: 20' ; high pressure centrifugal pump powered by a engine at approx. 2000 rpm ; pressure line: 6" at a length of 18" directly followed by a...

Homework Statement Hi. I know that a refrigerator and heat pump do the exact same thing, which is transferring heat from a cooler area to a warmer area. This is what I've gathered from my university notes. My question is: is it necessary for the area it's transferring FROM to be COOLER than the...

Hi everyone, I am an electrical engineering student and in my free time, I make educational youtube videos about electronics. (youtube.com/SolidStateWorkshop). I'm working on a video right now about transistors. To help explain their operation, I am attempting to use a hydraulic circuit...

Hi! The problem is in connection with variable speed heat pumps used for heating purposes, where the source/reservoir is ground/rock. The ground has temperatures around 5-7 celsius. Is it correct that these systems only can deliver one temperature at one load? E.g.: at 30 % of full power, it...

I connected my 12 volt 3 amp bilge pump to a 36 watt 3 amp 110v ac/12v dc power converter. The impeller blade vibrates but does not spin so it can pump. The pump operates ok when connected to a 12 volt 3 amp/hr battery. What's the problem?

Alright everyone, I know this is a huge question, but I've done enough homework to at least have informed ignorance on the subject. I posted a similar topic here, but that question was more conceptual and this definitely is much more of an applied use question. (Edit: I realize that the above...

Hi,So let's start with this, I don't have a lot of electronics circuits background and not really an idea on how to build an electronic circuit. Ok, now the problem, at my job I am in need of controlling a 24VDC 0,570 Amp pump with a pot, preferably one with a "preset" in it so that the values...

I have a water tank fed from a piping system that has very low head in it. As a result flow tends to be low. See sketch below. I am thinking of ways to boost the flow. I already have a centrifugal pump at the site. Could I use its flow to boost the flow from the incoming pipe via a venturi /...

Hello all, I have a Varian M4 diffusion pump that has a 6 inch diameter opening at the top, is it okay for me to connect that to a reduced size opening like just 2 or 3 inches diameter so that I can use a smaller valve? I am only trying to pump down a cubic foot or two sized chamber. I am...

Hello everyone, I am designing one hydraulic system. In that system their is total 8 no of component function. When all the component work that time its take 150 Bar pressure and 140 lpm flow. but this all are all time not working together. they are hardly 4 to 5 time working together in day...

I'm tying to find any clue about the timescale of the biological pump. That the carbon is recycled to the surface ca. 1,000 years is clear but the timescale of the biological pump seems hard to find. There is an report I saw when I was surfing the internet saying that the timescale can range...

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...

There is a long pipe connected to the inlet of a pump (air). As the speed/flow of the pump increases, according to the mass flow equation (pVA) something has to give. At what point does the velocity begin to increase? Ambient conditions have an infinite cross sectional area. Density has to...

I'm using a 3 phase 5HP motor pump n want to use capacitor. Which capacitor should I use and how to connect it to all the three phases? Please do needful

Little bit of a disclaimer: if you take a look at my first (introductory) post, you'll see that I'm working towards aerospace engineering; therefore, this is leaning towards turbopump design, but for the time being I'll start out slow. Basically, I'd like it if anyone could help me get a sense...

I bought a new home AC (split; 1.5 ton) and the tech the company sent to install it didn't seem to have neither a vacuum pump nor a N2 cylinder in his kit. I am leery. Is it really possible to install an AC without these items? Can he do a reasonable job evacuating the lines & leak testing any...

Lets say I have two water pumps that are the same and each can output around 100 psi of water pressure. If I were to connect them in series meaning that the output of 1 goes to the input of the other will the total pressure output at the last water pump be around 200 psi? what if I connect them...

Dear All, Would you please guide me regarding I want to make a mist fan. A low level mist is required almost 4 to 5 feet. I need all information regarding tube dia, nozzal specification specially pump specification. Thanks in advance. Regards, Kashif Usman

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...

Homework Statement 800L/h rated pump 12.6mm outflow pipe. Static head height 1.10m There seem to be no undue turbulence in the flow. Environmental pressure is just atmospheric (1bar) 2. Homework Equations Unknown The Attempt at a Solution I have done the physical experiments which is how...

Homework Statement A heat pump fitted with a 120W electric motor supplies 600W of heat per second to a room from outdoors. Calculate: a) the coefficient of performance of the heat pump b) the heat gained from outdoors. Homework Equations Coeff of performance for heat pump = Qin/ W =...

Hello, I'm performing some simulations of apump with a hydraulic accumulator. I don't understand clearly the results. In a closed loop, i connected a pump with a Valve in order to create a pressure drop. The results are a linear increase of the pressure in the circuit and the pressure drop is...

Hi, I am building a hose system with an automatic liquid dispenser using venturi effect. The 12v pump is taking water in a tank via a 3/4 pipe and has a capability of 2.9gpm at 50psi. The main system is built with 3/4 pipes and a 5/8 hose. The siphon pipe is 1/4 and I added a check valve...

I have a rain barrel 20 feet below a deck. I want to pump water from the rain barrel up to a small container (2 gallons) once a day. I'm thinking it should take less than 15 minutes to fill. I've found a pump I like that has the following specs, but it may be too powerful, but it's cheap ($15)...

Changing the potential energy of water is frequently used as a means of storing excess renewable energy when it is not needed and using it when it is needed. An electrically-powered pump with efficiency 62 % raises a 10 kg mass of water a height of 10 m. The water is subsequently allowed to...

Hi there, I have set up a flow loop for a uni experiment that will teach other students about the bernoulli equation. The loop will use a few working section that will increase and decrease pressure due to diameter, velocity and height changes. I first set-up my loop with the pump at the end...

Is it possible to pump out water from three tanks all under a different vacuum level using a common pump and common suction header? Or would this arrangement cause problems? The destination is a single tank at atmospheric pressure. See Sketch below. I'm trying to intuitively figure how the...

Homework Statement http://imgur.com/ktfgCAL flow rate: 0.057 m^3/s cross sectional area of all pipes: 1.864*10^-2 m² frictional losses inlet pipe: 1.83m frictional losses outlet pipe: 3.66m density: 1000 kg/m^3 g= 9.81 N/kg Asked: pressure at inlet pressure at outlet necessary pumping...

Hi, so I'm bad at physics and don't know if this is even possible. I've got a single submersible water pump that is submerged in one of the tanks and the other tank is right next to it. Is it possible to somehow pump water from both tanks or make the water from the other tank flow to the one...

Homework Statement A centrifugal pump is used to pump water from one tank to another through 1000 equivalent ft of 4 in. schedule 40 steel pipe as shown in the figure. The second tank is located 25 ft above the first. Show that the pressure drop (in psi) in the pipeline between 2 and 3 is...

Homework Statement http://postimg.org/image/lb6hsi843/ I am trying to draw an energy and hydraulic grade line for this system. The gauge pressure is supposed to be 0 at the points shown and those are centrifugal pumps. What I don't know is how flow and pressure vary throughout Homework...

Can I make diffusion pumps from aluminum? I am going to create parallel connected diffusion pumps for many UHV purposes. I see that aluminum that is treated to prevent outgassing is used for UHV valves, chambers, and reactors. I'd like to know what temperature diffusion pumps boil their...

I am a mechanical eningeer, designing a prototype for a system in which a heat pump moves heat between two process tanks with built in heat exchangers. I want to use an off the shelf heat pump but I want the process tanks to be the evaporator and condensor. If I buy a heat pump and bypass its...

Homework Statement A cylindrical pump of length 25[cm] pumps air in atmoshpheric pressure ant temp 270C into a big tank. the manometric pressure in the tank is 4[atm]. at which distance will the air start entering the tank. Homework Equations In adiabatic process...

OK, So I have been having an on and off debate with my family about this. I saw a pump at Home Depot that said it has a 30 ft head. Then it went on to show that the flow rate varied as the output of the pump changed in height. Now I thought that this was wrong. I just finished a course in...

New member here. This might be the coolest subject for a forum I've seen in awhile (that probably sounds like robot spam). On to business... I have been scr*wed by a succession of people over our home's improperly plumbed hot water. It takes forever to get hot water to the faucets. I bought a...

I've a hot-liquid filled tank (approx. 5000 Litres) at ground level within which there's a considerably good vacuum. Approx. 100 mmHg abs pressure. Is it possible to pump out liquid from this tank using a pump (any kind) without destroying the vacuum in the tank? What kind of pump would work...

If I have a pump of 50psi and 2L/min flow rate and it is connected to a nozzle. The nozzle catalogue specs for example shows that : 40psi = 0.5L/min 50psi = 0.6L/min 60psi = 0.7L/min Is flow rate at the nozzle output 0.6L/min? Regardless of the pump flow rate, as long as pressure are same...

Hi everyone, I have a report to write for tomorrow and I am struggling with part of my conclusions. Essentially we have gained results from a heat pump as follows COP = 2.56 Carnot COP = 18.9 Energy Discrepancy = 0.015 Would anybody be able to help me interpret these results, ie are they...