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Fluid Flow Systems
Sample case 2: Natural circulation
Free or natural circulation is called if the flow is not driven by an external force but by a pressure gradient due to locally different characteristics (temperature, pressure and density) in the fluid. Let us have the following “boiler-feed pipe-heat exchanger-return pipe” system. This could be the heating system of a simple building (detached house), where the circulating pump doesn’t operate, but with a bypass pipe, the TS works. Simplifying the network, we get a closed system with 3 nodes and 3 edges (Figure 6.6). The system has no demand, so the mass flow is constant. The caloric equations are not written; the thermal power is considered as the temperature of the outgoing and return pipe, and hence, the density of the fluid is different. (For simplicity, the two pipe edges’ hydraulic properties (length, diameter and pipe friction factor) are the same.)
Tartalomjegyzék
- Fluid Flow Systems
- Copyright Page
- Nomeclature
- 1. Introduction to Fluid Mechanics
- 1.1. Basic principles of fluid mechanics
- 1.1.1. Continuity equation
- 1.1.2. Bernoulli equation, energy law for fluids
- 1.1.3. Ideal gas law
- 1.1.4. Energy law for compressible fluids
- 1.1.5. Flow in pipelines
- 1.1.6. Flow losses
- 1.1.7. Friction factor of straight pipes
- 1.1.8. Performance curve of pipeline systems
- 1.1.9. Pump characteristic curve
- 1.1.1. Continuity equation
- 1.2. Sample questions for the Introduction
- 1.1. Basic principles of fluid mechanics
- 2. Historical introduction to water networks
- 3. Steady-state flow modeling in pressurized networks
- 4. Open-channel flows
- 5. Stationary flow of compressible fluids in pipelines
- 6. Modelling of thermal systems
- 7. Transient cases
- Bibliography
Kiadó: Akadémiai Kiadó
Online megjelenés éve: 2024
ISBN: 978 963 664 044 6
This university textbook is the joint work of the colleagues of the Department of Hydrodynamic Systems, Faculty of Mechanical Engineering at the Budapest University of Technology and Economics. Its main aim is to help students deepen their knowledge of the subject Fluid Flow Systems. It also provides a brief historical overview and a basic introduction to fluid mechanics. It discusses each chapter in varying degrees of detail based on the course material. At the end of each chapter, check questions guide students in their learning.
Hivatkozás: https://mersz.hu/till-csizmadia-weber-fluid-flow-systems//
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