Pump Definition and 655 Threads

Efficiency of Ejector "as pump" I was asked to find the efficiency of a steam ejector experiment "as a pump". So I tried the formula : [(m(P/density + V^2/2))discharge - (m(P/density + V^2/2))suction]/ (m(P/density + V^2/2))steam inlet. I am getting an efficiency of 0.5%. Is this a...

An aquarium 2 m long, 1 m wide, and 1 m deep is full of water. Find the work needed to pump half the water out of the aquarium. (The density of water, p, is 1000 kg/m3, and acceleration due to gravity, g, is 9.8 m/s2.) So in order to truly understand how to do these kind of problems I decided...

Homework Statement Why do diarrhea patients receive a solution containing a high concentration of glucose and salt?

Hi all, I am currently working on a water pipeline project and am investigating a pipe burst scenario at a pump station with the aim of producing a flow rate entering the pump room in the event of a burst. For simplification and what has been used previously on similar jobs is to model...

Hi All, i have a requirement to design a pump to pump 4000 litres of water a day at 40 mtr. head. which pump will be most suitable for this application and cheap?? can anyone of you help me in this subject ? and also where can i refer to design that particular pump? thanks in advance...

Have a spinning rotor/impellor with open channels directed radially outward (similiar to a radial vane centrifigal pump with 90 degree straight blades - such as an older automotive heater fan ). The channels have constant area from the inner to outer radius. Realize this isn't a very efficient...

hello guys here's another question my pump not pumping liquied althoug the pump is under the tank why ?

Alright, so here goes, and by the way, this isn't homework, just in case you're wondering. Question 1: So, i have a 12vdc 500amp battery/car inverter and a 12vdc 11amp sump pump. If I wire it up, approximately how long will they last? Question 2: Also, I have a power inverter for my car, can I...

A right cylindrical tank is filled with sea water. The tank has a radius of 2 feet and a height of 8 feet. If the water level is now 2 feet below the top of the tank, how much work will be required to pump the sea water to the top of the tank? (The weight-density of seawater is 64 Ib/ft3.)...

Folks, I am looking for a blower to produce a flow of ~150cfm (~4m^3/min) while pumping H2 pressurized at ~40bar. The blower needs to provide a pressure increase of ~5bar. I am wondering if something like a supercharger blower might work.

This may seem like a stupid question, but what is the relationship to flow and pressure in a pump to flow and pressure in nozzles. Specifically i have 5 nozzles that i am pumping into rated at 3000 Psi @ 0.84 GPM, what do i size my pump to? Do i need a pump rated for 3000 Psi @ 4.2 GPM or do i...

Hi all, I have the feeling I'm missing something big. Consider first a capacitor having +9V on both terminals, in this case nothing happens. Now I set the negative terminal to 0V, and make sure a current is able to flow; the capacitor will now charge up to 9V, right? Ok, now I make sure...

Sirs, I need to make a pump to draw molten aluminum from one container to another container. The first container height is 1.5m. I wish to us a screw enclosed within a cylinder and powered by a motor. Can anyone help me with the detail design of the screw and cylinder? I welcome any other design...

I'm confused how a magnetic pump works as described in my text. I'll quote: """Liquid metals, such as the molten sodium used in certain nuclear reactors, can be moved through pipes using an electromagnetic pump that has no moving parts. If the metal has to be moved in a pipe that is...

Ok I searched and found this as the answer from a previous topic "The sodium potassium pump is required to maintain osmotic balance and stabilize the cells volume. If you treat an animal cell with ouabain, which inhibits the Na+/K+ pump, it will swell and often burst. Cells contain mostly...

Can anyone please help me with this problem? Consider the act of evacuating a chamber with a vacuum pump. Vacuum pumping rates are usually given in volumetric pumping speeds, Sp, whose units are typically volume/unit time, e.g., 1 m3/min. In other words, the number of molecules in 1 m3 at...

I am doing a project of hydraulic vehicle. My professor ask our team to install a hydrualic pump and motor in the vehicle. We are considering to purchase a set of hydraulic pump and motor, and we have the following requirements: We have an existing electric motor of 22kW, 60Nm (continous)...

We live in rural area and get our water from a well. Due to the high iron content in the water, beyond all of the normal considerations for purity, chlorine [bleach] is required to react out all of the iron. For years I used diaphram-style pumps that had a life expectancy [based on my...

urgent: mini pond/fountain pump workings Well, it's not life-or-death but, I've got a deadline for tomorrow to finish this thing I've been working on for months and I've just came bang up against what might be a showstopper. I'm building a pond widget that is powered by an 11W mini pond...

In many paper or book on laser, it is quite oftern to mention the pump and probe field. I understand what the pump field is, but what about the probe field? What we need a probe field? How does it work (how to "probe")? And why a probe field is always a weak field?

Hi If a vacuum pump is operated on a test container (say at 150 degree C) and as a result at the outlet,water is condensed and collected. What would be the relation between Vacuum deviation in the test container and quatity of water extracted. Is it to do with Ideal gas equation, PV=nRT...

I hope I am asking this in the right forum. Lets say you have a simple hand pump, similar to a bicycle pump, and you exert X amount of force on the handle. How do you calculate the resulting air pressure it creates out of the small valve at the end? Obviously friction between the O-ring...

Hey guys im in the process of designing a piezoelectric liquid pump, i am looking to make the structure out of RP printer for now and use a PDMS diagrphram for the piezo device to be mounted apon. Have any of you guys worked with piezo materials before as i am in need of a strong high...

If anyone here has experience with hydraulic hand pumps(those 10000 psi models), could you tell me how hot the oil, and by extenstion the pipes get during compression?

i need to find a way to control the syringe pump in my lab so that i can control the flow rate in real time from the computer, ideally from a simple dial i scale up or down. the pump can connect to the computer using a rs-232 port and someone suggested to me that labview would be the easiest...

Here's the situation. We have tried to replace a "non-clogging Submersible" pump that has been in service for 20+yrs and are experiencing catistrophic failures. The new pumps are the same rating as the old (as far as nameplate data goes) and nothing has changed to the electrical system. The...

hi, I've been inspired by this wind generator design: http://www.instructables.com/id/Pringles-Wind-Turbine-Pleech---Version-One/ to make it operate in reverse, that is, feed alternating current and make the thing spin. The purpose of this is to make a pump by putting a wheel (similar to those...

I am building a small device that operates underwater so I am powering it from this...

Homework Statement A heat pump with COP of 2.5 is used to heat a house. When operating, the heat pump cosumes 8kW of electrical power. If the house is losing heat to the outside at an average rate of 40000 kj/h and the temperature of the house is 3 degree celcius when the heat pump is turned...

I want to build a pump system using the water pressure from a 36 inch deep pond (up to 96" weather permitting) to pump water to a holding tank 100 feet above the 36" water level. after reading thru 15 pages of posts "water pumps" etc. on PF my head is spinning. At the dam there is access to...

Hi, I'm doing a science project involving the energy required to run a heat pump for the average size automobile measured in watts. I've been going through sites like mad, but can't find anything helpful. can anyone give me an estimate, or better, a reference to a site with such data on it? I'm...

Hi Guys I am trying to use a water filter in line with a 12V water pump rather than off the mains. The water filter requires 10psi minimum and a maximum of 125psi, I am using 15mm copper pipe and the pump is 800mm from the water filter. I have not yet decided on a pump yet as this is...

I have 5 Solar Concentrator panels I have built with a 1 meter wide by 3 meter long footprint each. The solar absorber tubes are 3/4" Type M Copper piping that is black chrome coated (98% absorptivity) surrounded by a borosilicate glass envelope (92% transmissivity). There is a hard vacuum...

Hiya my question is Why is it impossible with a pump to suck water from a lake if you place the pump 15 meters above the water I think it has somthing to do with gravity but if anyone could explain it in detail that would be great Thanks :)

Homework Statement A pump is electrogenic, meaning that 3 Na ions are pumped in for 2 K ions that pumps out. Given that the active current --> I' (Na) 30 E-9 , find the passive current of Na --> I (Na). Assume cell is in steady state so Vm, [Na] inside and [K] inside is constant...

i need to find 3D pump geomtery in solidworks, catia, or proengineer

hi, i've read somewhere that modern vane pumps' vanes have an area of contact on the housing and the older versions had line contact. does anyone know how this is achieved? why is this better? how is this connected with friction? what types of seals are used, rubber or synthetic? any thought...

Homework Statement The question asks us to advise the company on a heat pump (and give reasons) which is claimed to deliver 1500J to a room at 280K by consuming 50J of work per cycle pumping heat from the surroundings at 270K. I've drawn a diagram of the heat pump, taking heat Q2 from a bath...

Dear Engineering Experts, I saw this pressure washer on youtube : and could not figure out exactly what type of pump is used. I could not find the manufacturer's home page. Websites featuring this are : http://home-solutions.hsn.com/nomad-h2o-on-the-go-power-washer_p-3652885_xp.aspx...

Dear all, I have worked with a challenge for two full days now without managing to solve it. I would be MOST grateful if anyone could help me sort out my confusion concerning the problem. I have a suction hose (100m, Ø 5cm) that is connected to a larger mouthpiece in the end (Ø 30cm). The...

Just a quick question, which mayb be very simple to answer, I have a system which is currently running R134a as the working fluid, are there specfic circulators i have to use to move the fluid around? I have the pressure drop and head for the system calcuated, but am stumped on what pump i...

Homework Statement A 2 Horsepower engine runs a water pump for 24 hours a. What is the work done by the engine? b. What would happen if a 1.0 horsepower was used to pump the same amount of water? W= F * D But i don't know what D is? so how must i solve this? please help! :[

Homework Statement A tank is in the shape of an inverted right circular cone with a radius of 10 feet and a height of 6 feet. Assume the tank contains water to a depth of 4 feet. Find the work required to pump all but 1 foot of water from the tank. Homework Equations W=\int^{b}_{a}Fdx...

I have completed the first part of the problem below. I am checking to make sure that I have the right thought process... Also the next part of the question asks if the inlet pressure to the pump is -2.36 psi compute the power delivered by the pump to the water...How would I approach that...

1.What happen when we connect 3~ phase star connection 415volts pump to single phase 250 volts power supply?,it gets burn?. and 2.How to check motor winding of any motor with multimeter? Thank you.

Homework Statement Some electric-power companies use water to store energy. Water is pumped by reversible turbine pumps from a low to high reservoir. To store the energy produced in 1.0 hour by a 120*106 electric-power plant, how many cubic meters of water will have to be pumped from the lower...

Homework Statement A spherical tank is full of water. If radius r = 3m and height h = 1.5m, find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 \pi)Homework Equations Work is the integral from a to b of f(x)dx. The Attempt at a Solution Volume= area *...

the ends of an 8 foot long water trough are equilateral triangles having sides of length 2 feet. If the trough is full of water, find the work required to pump all the water over the top.

A constant volume of 1800 cf of water needs to be introduced into the base of a 60 ft tall (15x15) water tank. I need to determine the hp/kw needed in order to do this. Can anyone explain the math on determining this? Thx Jeff

I was told that a pump in a heating system that from time to time pushes against closed valves is not good for the pump. If so, how will it affect the pump in the long run?