# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## Information about this web site => Request for physics Simulations => Topic started by: xirja on March 06, 2009, 06:03:37 am

 Title: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on March 06, 2009, 06:03:37 am Hi,I was happy to see both the Buoyant Force and the Induction simulations.  Can you combine the two in a way such as:(http://www.xirja.com/BuoyantMagnetFig1.jpg)whereby the tops of two of the above figures are near the center of rotation of a spinning cylinder, so that G can be modulated?Dimitri Vorkapich--- Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: Fu-Kwun Hwang on March 06, 2009, 08:27:55 am I do not understand how the above device works. PLease write down physics description about how it works. I need to fully understand it to be able to create simulation.-*- Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on March 06, 2009, 08:32:50 pm The object is to relate angular velocity to inductance, buoyancy, and gravitywith respect to a buoyant permanent magnet in order to produce electricity.A small permanent magnet embedded in a low density material ( the capsule ), risesthrough a high density non viscous fluid in tube section 1.  The buoyant capsule leapsout of the fluid and is guided by inertial forces around the top ( frictionless ) and thenfalls down tube section 2.Both tube sections have coils for inducing a current.  At the bottom there is an electricmotor rotating the section with the red spaces which transfers the capsule from the higher section 2 to the lower section 1.  The red space is where the capsule moves through.  The blue space is where the fluid moves through and is fixed  ( There is an error in the graphic - the blue lines indicating the fluid channel should be in front of the grey lines).  The blackbar is the displacement bar.Then to have two of the figures embedded in a cylinder and aligned about an axis toallow for G to be increased:..........|..............__...|...__.......o__) | (__o.............|..........<------G------>Maybe for general demonstration it would be better to leave out the exchange section andhave the capsule manually inserted for a one time spin through?--- Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: Fu-Kwun Hwang on March 06, 2009, 08:46:04 pm 1. I do not understand why you called it an electricity generator ? Where is the input energy comimg from?2. If the magnet at the left side moving up is due to Buoyant, why it moving down at the right side? If the system is symmetry, the physics should be the same.3. Is there any non viscous fluid in real life? Have you found one? Is this a "thought experiment"/device? Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on March 06, 2009, 08:57:19 pm 1.  The motion of the permanent magnet through a conductive coil, DC generation.2.  The right side has no fluid, it is air.3.  I am not sure, it is probably an ideal.  No.  The lower the viscosity the better. Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: Fu-Kwun Hwang on March 06, 2009, 09:18:54 pm O.K. The right side is air.How can the magnet leave the fluid and moving into air ? And how can magnet enter the fluid again? The pressure at the bottom of the fluid is higher than the air.You need to provide energy!It seems to be another device which violate the conservation of energy. Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on March 06, 2009, 09:55:27 pm As in your demonstration:http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=266.0If the density of the block is .25 and all the other initial conditions are the same,the block leaps into the air.  The lower the block density, the higher into theair the block goes.The rotating exchange section divides the two tubes so that the pressure at thebottom of the water filled section 1 never interacts with the air filled section 2directly.In Figure 3c:(http://www.xirja.com/sc002af1a5.JPG)You can see that when the section has rotated to this point the red sections are notconnected to either fluid filled section 1 or air filled section 2. Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: Fu-Kwun Hwang on March 06, 2009, 10:14:17 pm 1. It is a simulation for teaching purpose and it is assume there is no viscoity(ideal fluid).2. No matter what you did. The magnet need to move from air (lower pressure region) to bottom of fluid (higher pressure region). Otherwise, it is not a continue workable loop.You need to do WORK to move magnet from air back into fluid again.The WORK you need at least should equal the energy you gain when it move up.From my point of view: It is not a workable device and it violate the physics principle I have learned.  So I would not be able to create a simulation for you. Sorry! Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on March 06, 2009, 10:36:58 pm But as N loops can vary ( the length of the sections ), and G can vary ( the rateof rotation ), there is a point at which the output is greater than that used to turnthe section at the bottom.Anyhow I do appreciate you considering the item.So, I think it is wonderful that you have these demonstrations.  To be joinedtogether in useful form at a later date!http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=266.0  Buoyancyhttp://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=687.0  Inductionhttp://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=192.0  Centripetal ForceThank you,--- Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on March 17, 2009, 01:37:56 am Also forgot to mention the possibility of using Mercury (Quicksilver).  With a viscosity near to waterand a density ~13.6 times as great as water, wouldn't a magnet embedded in a styrofoam capsule fly?--- Title: Re: Electricity Generator With Buoyant Magnet Assembly Post by: xirja on April 12, 2009, 08:47:14 pm Just finished conceptual animations if it is of any interest.(http://www.xirja.com/brmganimfs.gif)(http://www.xirja.com/brmganimts.gif)(http://www.xirja.com/brmganimgs.gif)---