![]() ![]() When your battery power level is low, you’ll receive a notification via the app and/or email to order new batteries. The location of the wireless bridge in your home depends on where your meter is (usually, but not always, at the curb in front of the house) the recommended maximum distance between the two is 1,000 feet.īecause the gadget installed on the water meter is battery-powered, you’ll eventually have to spring for a new proprietary battery ($14.99 before shipping and taxes).Īccording to Flume’s website, the lithium metal battery pack shipped with the sensor should last about a year under optimal conditions, and if it lasts six months or less, you’re encouraged to contact customer support. My final out-of-pocket cost was $38.66.ĭepending on the strength of your Wi-Fi signal and the distance between your router and the Flume’s wireless bridge, you may need to invest in a Wi-Fi signal booster (easy to find online at $20 and up) to make things work. The $25 was back in my bank account the next day. My total up-front cost was $63.66 ($14.66 of which was for shipping and taxes), and within minutes - literally - of finishing the installation, I received an email letting me know my refund had been processed. One of the things that first caught my attention about the Flume was the deeply discounted price available through the LADWP partnership: $49 (before taxes and shipping) instead of $249, with $25 of that refunded after the device’s installation. Explain your answer.Here’s some of what I learned along the way. compare to the max velocity in Part C.? What does this mean for the flume originally described in the problem statement? Evaluate the original assumptions: Is this flow really Laminar? Developed? Steady? Uniform? EXTRA CREDIT: Which term(s) in the Navier Stokes Equation did we assume were zero when (according to your observations in Part e.) they must be non-zero. What would be the maximum velocity in a 10 cm diameter pipe that is 4 meters long (at 20☌)? Part e.) How does the velocity of Part d. A reasonable sized pipe in our fluids lab may have a length of 4 meters. Part d.) Equation 10.3 in your book gives a relationship between the distance (length) that it takes laminar flow to develop in a pipe (starting from a storage tank). Part c.) What is the max velocity in the flume and where does it occur? Notice it seems like a big number for a tiny flume. ![]() In addition the slope of the velocity profile at the bottom of the flume is virtually zero. Assume the law of the wall applies at the bottom of the flume. Part b.) Use Part a.) to derive an equation for the velocity (u) in terms of y. Use the Navier Stokes Equation and come up with an equation in the streamwise direction to apply to this flume (in other words, plug in numbers and cancel out unnecessary terms). Y = 10 cm 0.05 Navier Stokes Equation is as follows: du d u dt“ ds 1 dp.d'u d s* tu duz - 9s Part a.) Assume the flow in the flume is fully developed laminar flow, steady and uniform. ![]() The bottom of the flume is at a 0.05° angle with horizontal Assume it is water at room temperature (20☌) The flume is 10 cm wide and open to the atmosphere. ![]() PROBLEM 1: Below is a rectangular, flume set up. ![]()
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