The open tank contains water at 20 °C and is being filled through section 1. Assume incompressible flow. First derive an analytical expression for the water-level change dh/dt in terms of arbitrary volume flows (Q1, Q2, Q3) and tank diameter. Then, if the water level h is constant, determine the exit velocity v2 for the given data v1 = 3 m/s and Q3 = 0.01 m3/s. Given that d = 50 cm. D₁ = 5 cm 3 Q = 0.01 m³/s h Water D₂=7 cm

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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**Educational Content: Water Flow Analysis in an Open Tank**

**Problem Statement:**

The open tank contains water at 20 °C and is being filled through section 1. Assume incompressible flow. 

1. Derive an analytical expression for the rate of change of the water level, \( \frac{dh}{dt} \), in terms of arbitrary volume flows (\( Q_1, Q_2, Q_3 \)) and tank diameter \( d \).
2. If the water level \( h \) is constant, determine the exit velocity \( v_2 \) using the given data:
   - \( v_1 = 3 \, \text{m/s} \)
   - \( Q_3 = 0.01 \, \text{m}^3/\text{s} \)
   - Given diameter \( d = 50 \, \text{cm} \).

**Diagram Explanation:**

- The diagram shows a vertical open tank with a water inflow at section 1 (left side), an outflow at section 2 (right side), and an additional outflow marked as section 3 (top).
- Inflow at section 1 has a diameter \( D_1 = 5 \, \text{cm} \).
- Outflow at section 2 has a diameter \( D_2 = 7 \, \text{cm} \).
- The top outflow, marked as section 3, has a fixed flow rate \( Q_3 = 0.01 \, \text{m}^3/\text{s} \).
- The tank diameter \( d \) is given as 50 cm.

**Select the correct exit velocity \( v_2 \) from the options:**

- \( 5.38 \, \text{m/s} \)
- \( 3.42 \, \text{m/s} \)
- \( 2.56 \, \text{m/s} \)
- \( 4.13 \, \text{m/s} \)

**Solution Approaches:**

To solve this problem, apply the continuity equation for incompressible fluid flow, and consider the conservation of mass in the system. 

By maintaining the water level constant (\( \frac{dh}{dt} = 0 \)), you equate the inflows and outflows to solve for \( v_2 \).
Transcribed Image Text:**Educational Content: Water Flow Analysis in an Open Tank** **Problem Statement:** The open tank contains water at 20 °C and is being filled through section 1. Assume incompressible flow. 1. Derive an analytical expression for the rate of change of the water level, \( \frac{dh}{dt} \), in terms of arbitrary volume flows (\( Q_1, Q_2, Q_3 \)) and tank diameter \( d \). 2. If the water level \( h \) is constant, determine the exit velocity \( v_2 \) using the given data: - \( v_1 = 3 \, \text{m/s} \) - \( Q_3 = 0.01 \, \text{m}^3/\text{s} \) - Given diameter \( d = 50 \, \text{cm} \). **Diagram Explanation:** - The diagram shows a vertical open tank with a water inflow at section 1 (left side), an outflow at section 2 (right side), and an additional outflow marked as section 3 (top). - Inflow at section 1 has a diameter \( D_1 = 5 \, \text{cm} \). - Outflow at section 2 has a diameter \( D_2 = 7 \, \text{cm} \). - The top outflow, marked as section 3, has a fixed flow rate \( Q_3 = 0.01 \, \text{m}^3/\text{s} \). - The tank diameter \( d \) is given as 50 cm. **Select the correct exit velocity \( v_2 \) from the options:** - \( 5.38 \, \text{m/s} \) - \( 3.42 \, \text{m/s} \) - \( 2.56 \, \text{m/s} \) - \( 4.13 \, \text{m/s} \) **Solution Approaches:** To solve this problem, apply the continuity equation for incompressible fluid flow, and consider the conservation of mass in the system. By maintaining the water level constant (\( \frac{dh}{dt} = 0 \)), you equate the inflows and outflows to solve for \( v_2 \).
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