Pump Definition and 655 Threads

I understand that the purpose of a vacuum pump is to remove the gas molecules from a sealed volume to create a partial vacuum, but just what is actually happening to the gas molecules throughout this process? I have been researching online, but have not found any guides that clearly explain the...

Hey folks, I'm trying to do a bit of back-of-the-envelope stuff for a hypothetical slurry pipeline, but it's been a while since I've done any fluid mech./dyn., and I have no confidence in my numbers -- please jump in wherever you catch an error. First of all, I'm making the assumption that...

Homework Statement I have attached a copy of the homework as there is also a picture of the pump. This problem is number 6. A centrifugal pump processes j = 18m3/min of water, with inlet and outlet velocities of v = 15m/s. The impeller rotates in the clockwise direction around the...

what kind of a pump is used in creating vacuum in vacuum flasks or thermose. Diffusion pump, Roots Blower, Rotary vane pump

Dear Colleagues, I need a reference (for the article "Steady-state physiology…" I have just written) that proves the pumping role of Na,K-ATPase. I have tried to locate any publication that demonstrates the pumping function of Na,K-ATPase, but have found nothing. Please help me with...

Hi I have a pump which for 0 head will provide a max flow of 12 l/min (0.0002 m^3/s). For the piping I am using (3/8"), by my calculations this gives a theoretical MAX mass flow rate of 0.2 m/s and a MAX velocity of 2.8 m/s. As i understand it, these values are not taking into account (1)...

I am currently doing revision for an upcoming exam and can't work out how this particular question is solved. Attached is an image of the system. Homework Statement A pump draws water from a large tank and delivers it to atmosphere through a 50 mm diameter nozzle at a level 10 m above the free...

Homework Statement A heat pump heats a house in winter by extracting heat from the cold outdoors and releasing it into the warm interior. for the transfer of a given amount of heat, (a) how do the entropies of the interior and exterior of the house change (increase or decrease) b)which...

With an average wind speed of 2.67 m/s I am designing a wind turbine which will pump a 1m head of water. I have calculated from the size of my turbine I will be able to pump a volumetric flow of 0.219m^3/s. This is where I am stuck.. I cannot calculate the size of pump which I will need. Can...

Is it possible to create analog of a heat pump which would be able to concentrate potential energy of electrons in one place, using some work, so there would be gain in energy?

Homework Statement When you push down on the handle of a bicycle pump, a piston in the pump cylinder compresses the air inside the cylinder. When the pressure in the cylinder is greater than the pressure inside the inner tube to which the pump is attached, air begins to flow from the pump to...

Hi, I'm having a little bit of trouble. I need to work out the amount of energy the wind provides at an average speed of 2.67m/s when the blades of a turbine are 0.5m in length? Also how would I use this energy in order to calculate the size of a reciporacting pump needed to pump a head of water...

We are designing a foot pedal mechanism to actuate two hydraulic pistion pumps. But the torque to actuate a pump is more than 50In-lbs at full stroke. In addition, a spring is used to make the control shaft of a pump return to its neutral position. Totally the torque to actuate a pump is...

Homework Statement Right people, I had an experiment the other day on the lab. I measured flow rate, delivery, power, Head, at certain speeds in a centrifugal pump. I put values of Head vs. Delivery on Excel and I got graph showing a curve . How can I predict this curve by calculation of...

Homework Statement A house is heated by means of a carnot engine operating in reverse (Heat Pump). The outside Temperature (Tc) is 270k, and the required inside temperature (Th) is 300k. If heating the house to this temperature normally requires 10kW of electrical heating, how much power is...

Hello, As part of my final year project I am to run a CFD analysis of a pump impeller. I have been provided with the impeller and diffuser CAD models and successfully imported these into gambit. However, after completing a number of the gambit tutorials I still have no experience in meshing...

i need some help becoase i become confused according to pump characteristic curve if the flow rate increased the head will decreased the question is how i can increase the flow rate and what is the relation of RPM with head and flow rate

I'm currently doing a testing on hand pump from 2 different brand. Let's say Brand A and brand B. Brand A hand pump is 20cc/cycle with maximum pressure 350 bar, Brand B hand pump is 25cc/cycle with maximum pressure 350bar as well. 1. brand A hand pump easily pump up to 92bar, but after i tried...

If pump's motor load is around 33 ampere and 48 volts, how do you calculate the maximum flow and the head? Note the it is a vertical centrifugal pump

Hi everyone, I am in the process of putting together a water feature and am having trouble selecting the correct pump for the job. The pump will be required to pump water to a vertical distance of approx 7.4 meters. A submersible pump would be best. The pipe coming up from the pump is 12mm in...

Does anyone know what type of pump is used in nuclear plant's pump house?

Homework Statement A heat pump has a coefficient of performance of 3.70 and operates with a power consumption of 6.91 103 W. (a) How much energy does it deliver into a home during 1 h of continuous operation? 9.2x10^7 J (b) How much energy does it extract from the outside air? ? JHomework...

Introduction Lately, i have been attempting to develop a better understanding of thermodynamics, but i have encountered a few problems. I considered that endothermic solvation, (e.g. dissolving KNO3 in water) is essentially the same as an absorption heat pump. This idea was based on the...

Hey. I've been trying to find a really small, micro water pump, direct current, in-line 2.5"x1.5" maybe slightly bigger, but preferably tubular in shape and as small as possible. Looked on ebay to no avail. Any ideas? It has to be cheap as well, something under $50. Oh and 1-2 GPH flow...

Hey just wanted to know the theory behind this. If i have a open reservoir say 20 ft above a pump and i want to pump the water that flowing down on the suction side to a reservoir on the discharge side 80 ft above, the static pressure from the suction reservoir should decrease the pumps work,but...

Hi I am trying to determine the power usage of a progressive cavity pump in an oil well setting. I have some data to analyze, where I know the amount of viscous rod torque (ft lbs) per 1000 ft of rod length, I can use various rod lengths, and I know the RPM. Calculating the total Rod Torque I...

Homework Statement An oil having a density of 833 kg/m^3 and a viscosity of 3.3*10^-3 Pa.s is pumped from an open tank to a pressurized tank held at 345 kPa gage. The oil is pumped from an inlet at the side of the open tank through a line of commercial steel pipe having an inside diameter of...

How does the water pump inside a steam iron work?

Hi Guys, I have a problem about the starting current of a pump's electrical motor. I have the working condition of the pump (torque, power, speed, P and Q) But how could I calculate the start up current of an IEC standard motor? Seems I has to gather a Torque-speed curve from the...

I am researching ground source heat pumps, however I do not completely understand how they work. I understand that a pump uses a small amount of electricity to pump heated ground water or an antifreeze solution through the a system of piping in the ground to transfer heat from the ground to a...

1. A tank is formed by revolving y = 3x^2, x = [0,2] around the y-axis is filled to the 4 feet point with water (w = 62.4 lb/ft^3). Find the work necessary to pump the water out of the tank over the top. I got the integral being from a = 0 and b = 4 and integrating [(12y-y^2)/3]dy with w and...

I am trying to fit a vacuum pump at one end of a pipe system and a cylindrical container with a size that has minimal clearance with the inner pipe wall would be inserted at the inlet to the pipe system. The purpose of the vacuum pump is to create a pressure difference so that the lower...

Good day I have a Honda GX160 fitted on to a Trash/water pump, I am planning to fit this as an emergency pump on my boat (I know it sounds a bit mad). I have found the perfect place for it (high up and in the dry) and I plan to bolt it down and pipe it up permanently ready to go. The only...

Homework Statement Find the work done in pumping all the water out of a conical reservoir of radius 10ft at the top and altitude 8ft if at the beginning the reservoir is filled to a depth of 5ft and the water is pumped just to the top of the reservoir. Homework Equations None The Attempt at a...

So, this seemed most appropriate for this forum, as it's essentially a question about pumps, pressures, and fluid mechanics. The set up I have that this question pertains to; There are two pumps that have lines running to a T-joint with a small chamber to allow for mixing before exiting...

is there any equations that can be used for calculating required pump pressure for a horizontal running water pipe given the pipe length, cross-sectional area, required flowrate and frictional loss co-efficient?? is this possible or is more information required?

Homework Statement I am having trouble with calculating the required pump pressure in a horizontal water pipe, 3Km long. i know that the flowrate is 600Kg/s, average velocity 5.6m/s, cross-sectional area of pipe is 0.107143m^2 and losses due to friction average 0.002 per meter Homework...

When I am dealing with dipole radiation, I faces a difficult problem. Is the phase of the radiation the same as pump wave?

I've come across seal pumps in a few power plant diagrams recently and I'm confused on what a seal pump actually does. As it was explained to me, the seal pump pumps water into/around a primary pump to seal the primary pump from leaks. However, something seems to be missing from this...

Homework Statement A pump has to raise water from a depth of 50m and eject it at 10m/s. If the flow rate is 2 kg/s, what horsepower is needed. Homework Equations The Attempt at a Solution t = s/v = 5 seconds m = t/flow rate = 2.5kg E = mgh = 1250J P = E/t = 250W...

please help me ,i have a project which i m not easy with can anyone help me in designing a a vapor compression cycle for cooling in the summer and if desired heating in the winter, and a ground source heat pump for cooling in the summer and if desired heating in the winter.

I have been planning a heat exchanger for my pool for quite some time. I'd like some reco's about pressures and pipe diameters. See attached diagram. The pool hose is 1 1/4" flexible PVC hose like this: http://www.poolsupplies.com/images/products/tn_105550.jpg The pump is a standard...

hello everyone, i run a small microbrewery and i have a need for a unique pump design, here are the requirements: 1) low agitation of pumped liquid (cider in my case) because its full of CO2 in suspension and i don't want the gas to come out in the pump 2) the pump will be used to mix 2 fluids...

Can someone please check this? Does this make sense? Homework Statement Determine the size (liters / hour) of a proportioning pump to feed ferric chloride for a .438 m^3/s water treatment plant. The optimum dose selected is 50mg/l. Ferric Chloride may be obtained in a liquid form that is...

how can i obtain the pump flow rate ? is this done by filling a certin volume and measure time or there is another method ??

how to obtain a centrfugal pump curve ? and how can say from the sound of the pump if its running under cavitation or not ?? and what's the cavitation signs for the pump

gear pump cavi ? well dear all we know that gear pump is a positive desplacement pump which has constant dioscharge at different loads my problem is i need an explanation to this sitiuation " from 1 month at my work i found a breakdown of lubricating pump used to pump oil on a bearing it...

a tank the shape of a cylinder has base radius 3/2 m and height 6m lies horizontal and has a spout of length 1m. Find the work to pump all of the water out of the tank. placing one end of the tank at the origin and using rectangular cross sections. I have attempted to first calculate the...

I am about to pour a concrete floor in an addition to my basement (about 13' x 24'). This room is adjacent to my electric water heater. I have bought a 9500 btu R-22 compressor which I plan to use to replace the electric element in my 50 gallon water heater. The condenser is the water heater...

I have to design a micro pump which uses a magnet as a plunger. the magnet is pushed and pulled by and electromagnet whose current can be controlled. I wanted to know that how do I relate the current in the electromagnet to the amount and flow rate of the fluid expelled by the pump. The...