Flow rate calculation question

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Discussion Overview

The discussion revolves around calculating the flow rate for a system involving a liquid reservoir containing hydrochloric acid. The participant seeks assistance in setting up the necessary equations to compute the time it takes for the tank to drain, given specific dimensions and properties of the fluid and outlet.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • The original poster describes the system variables, including the dimensions of the reservoir and the properties of hydrochloric acid, and expresses uncertainty about how to set up the equations for flow rate calculation.
  • Some participants suggest using Bernoulli's equation as a potential approach to solve the problem.
  • Links to external resources on Bernoulli's equation and previous discussions on similar topics are provided by participants as references for further exploration.

Areas of Agreement / Disagreement

There is no clear consensus on the approach to take, as the original poster is seeking guidance while participants suggest different resources and methods without resolving the uncertainty in the calculations.

Contextual Notes

The discussion does not clarify specific assumptions regarding fluid dynamics principles or the applicability of Bernoulli's equation in this context. The original poster's understanding of the variables and equations remains incomplete.

Who May Find This Useful

Individuals interested in fluid dynamics, engineering design, or those facing similar challenges in calculating flow rates in liquid systems may find this discussion relevant.

monet man
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Hello all. I am new to this forum. I am an electrical engineer, and I am working on a system which requires me to calculate a flow rate. Once I know this, I can continue with the design. Since I am an electrical engineer, I have insufficient knowledge of fluid dynamics to know how to set up the necessary equation(s) to compute the needed information. That being stated, I will tell all that I can about the system variables, and hopefully if I have given enough info, I will get some assistance in setting up the equation.

I have a cubic (6-sided) liquid reservoir which will contain hydrochloric acid (30% ~ density 1149 kg/m^3).

The bottom side of this reservoir has a 1" (2.54cm) hose that is used to drain this tank.

The hose is connected to a valve with a sharp-edged opening (orifice coefficient,Co, I assume is 1 (?)) which measures 3/8" (0.9525cm) in diameter.

I need to calculate the time that it will take the tank to drain. For calculation purposes, say that the tank is 1m x 1m x 1m, and the tank is full (height of HCl = 1m).

I feel that the height must be a variable for integration (i.e. dV/dy)...but I also want to know the height of HCl in the tank at any given time (i.e. dV/dt). I have been looking online for the answers all day, but my head is starting to hurt from all of the information that I am finding, and I think that I am making this way too complicated for myself. Any help is GREATLY appreciated.
 
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