What is Pumps: Definition and 114 Discussions

A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.Pumps operate by some mechanism (typically reciprocating or rotary), and consume energy to perform mechanical work moving the fluid. Pumps operate via many energy sources, including manual operation, electricity, engines, or wind power, and come in many sizes, from microscopic for use in medical applications, to large industrial pumps.
Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pond filtering and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers and other components of heating, ventilation and air conditioning systems. In the medical industry, pumps are used for biochemical processes in developing and manufacturing medicine, and as artificial replacements for body parts, in particular the artificial heart and penile prosthesis.
When a casing contains only one revolving impeller, it is called a single-stage pump. When a casing contains two or more revolving impellers, it is called a double- or multi-stage pump.
In biology, many different types of chemical and biomechanical pumps have evolved; biomimicry is sometimes used in developing new types of mechanical pumps.

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  1. T

    Cavitation in Pumps: Minimizing Damage & Flow Resistance

    Cavitation in pumps is a major problem. How can I be sure to minimize the damage it does? Is it correct that the worse case is a pump that gets much less flow and resistance that it can handle? These are not very big pumps, none more than 10 l/s.
  2. M

    Rotary Water Pump Design & Mechanism: Get Expert Help Now

    hello all , i need some help about rotary water pumps (centrifugal) design , mechanism , ... can anyone help me please ?
  3. B

    The Mystery of Gas-Powered Heat Pumps

    Are there natural gas powered heat pumps? My friend says yes, but the science is puzzling to me if so. Easy to understand burning gas to make heat, but what economical home system can make cold air from hot burning gas unless the heat turns a dynamo that makes electricity that powers the AC...
  4. A

    How can we use heat pumps to generate electrical energy efficiently?

    Ok I remember watching a video when I was twelve of this guy who used basically a refrigerator in reverse to create electrical energy from heat energy in outside air to power a house. Freon was run through black heat collecting panels, then through a compressor to make it hot. The heat energy...
  5. E

    Design calculator for Condensers, evaporators, heat pumps

    Hey guys Anyone knows a good calculator for condenser, evaporator, or heat pump design? common unknown parameters would be number of passes, or length of columns, depth or rows... Thnks
  6. A

    Conceptual question about currents and pumps

    Homework Statement Homework Equations I suppose the energy density equation applies here: (P2-P1) + pg(y2-y1) + 1/2p(v2^2 - v1^2) = Epump/vol - IR and I = Av The Attempt at a Solution My initial thought was that the current is the same. But then, since current is Av...
  7. R

    Heat pumps and coeffiecent of performance

    Hi everyone, I was hoping to ask a thermodynamics problem, specificially one about heat pumps and coeffiecent of performance. I am wondering if I am missing something. I am given that heat pump is heat a building. Inside temperature is to be maintained at 22 degree celcius, outside is...
  8. B

    Fountains before electric pumps

    Paris has many large and impressive fountains, as do many large cities sited on mostly flat topography, and I would like to know how these fountains operated so impressively before the advent of electric pumps? I understand gravity pressure concepts such the one used in the Hearst Castle water...
  9. H

    Integrated Heat Pumps: Learn How to Save Energy

    Hello, have you heard of integrated heat pumps? What is the essence of such an "integrated" heat pump? I mean how does it save energy? And what does the term "integrated" mean? Please kindly help.
  10. N

    Is a highly efficient Carnot engine suitable for use as a refrigerator and why?

    Show that the relationship betwee efficiency (n) of a Carnot engine and the coefficient of performance (w) of the same engine when operated as a refrigerator is given by nw= Tc/Th Is a Carnot engine whose efficiency is very high particularly suited as a refrigerator? Why? Well we know that...
  11. magi

    Heat pumps and shape-memory alloys motor

    Heat pumps and shape-memory alloys motor... Hi. Would it be possible to get some electricity from a heat pump and shape-memory alloys motor/engins with a generator? A heat pump use 1 kW and give you 3-5 kW heat. Would it be possible to use shape-memory alloys motor and a generator to...
  12. P

    Neumatics, Pumps, and suspension.

    Hello.. I am attempting to create a "lever arm" to lift things up... Using 1 or 2 Servos. How can I achieve it with Neumatics, Pumps, and/or suspension? Are they better than Gear Trains? The objects are some bottles and things around 2 lbs. Thanks
  13. R

    How Do Hydraulic Double-Acting Pumps and Their Spools Function?

    Will u please help me in telling me how do hydraulic doble-acting pumps work EXACTLY and the explanation of the spools function.
  14. S

    Pumps vs. Compressors: Understanding the Differences and Interchangeability

    pumps r compressors? a pump is used to increase the head of the fluid and a compressor is used to increase the pressure of the fluid...this pressure head is a form of energy and is transferable to other form [say increase in vertical height the fluid is raised] so can i use a pump and a...
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