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The Untold Story: Uncovering Fundamental And Sub Phenomenon Of Boiling Heat Transfer!

Jese Leos
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Published in Boiling Process: Fundamental And Sub Phenomenon Of Boiling Heat Transfer
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Welcome to this exciting journey that will take us deep into the mesmerizing world of boiling heat transfer! Boiling heat transfer is a phenomenon that occurs in various industrial processes and plays a crucial role in our everyday lives. It is essential to understand its fundamental principles and sub-phenomena to optimize energy usage and enhance heat transfer efficiency. Let's embark on this knowledge-packed adventure!

Understanding the Basics of Boiling Heat Transfer

Boiling occurs when a liquid undergoes a phase change from its liquid phase to a vapor phase. This phase change is induced by the application of heat to the liquid, resulting in the formation of tiny bubbles known as nucleation sites. These bubbles grow rapidly, rise to the surface, and release vapor into the surrounding environment.

The fundamental mechanisms governing boiling heat transfer can be broadly classified into three stages: nucleation, bubble growth and departure, and vapor removal.

Boiling Process: Fundamental And Sub Phenomenon Of Boiling Heat Transfer
by Kung Linliu (Kindle Edition)

5 out of 5

Language : English
File size : 481 KB
Text-to-Speech : Enabled
Screen Reader : Supported
Enhanced typesetting : Enabled
Word Wise : Enabled
Print length : 74 pages
Lending : Enabled
Paperback : 50 pages
Item Weight : 3.68 ounces
Dimensions : 5 x 0.12 x 8 inches

The First Phenomenon: Nucleation

Nucleation is the initial stage of boiling heat transfer, where tiny bubbles form on a heated surface. These bubbles are created when the local temperature reaches a critical value known as the nucleation temperature. The surface characteristics, such as roughness and wettability, significantly influence nucleation. It is essential to carefully design the surface properties to enhance nucleation, leading to efficient heat transfer.

The Second Phenomenon: Bubble Growth and Departure

Once nucleation occurs, the bubbles grow in size due to continuous heat input. As the bubbles grow, they detach from the heated surface and rise to the liquid surface. The growth and departure of bubbles are influenced by various factors, including surface temperature, heat flux, and liquid properties such as viscosity. Understanding these dynamics is crucial to optimize heat transfer rates and prevent surface burnout.

The Final Phenomenon: Vapor Removal

Vapor removal is the last stage of boiling heat transfer, where the vapor released from the bubbles is carried away from the heated surface. This phenomenon is influenced by the flow conditions and the physical properties of the vapor and liquid mixture. Efficient vapor removal is essential to maintain a continuous heat transfer process and prevent the formation of vapor film, which can hinder heat transfer.

Sub-Phenomena: Pool Boiling and Flow Boiling

Boiling heat transfer can further be divided into two sub-phenomena: pool boiling and flow boiling.

Pool Boiling

Pool boiling refers to the boiling that occurs when a heated surface is in contact with a pool of liquid. This can be seen in everyday scenarios like boiling water in a pan. Pool boiling is influenced by factors such as surface roughness, wettability, and subcooling. Understanding pool boiling is crucial in various applications, including cooling systems, power generation, and refrigeration.

Flow Boiling

Flow boiling occurs when a heated surface is in contact with a flowing liquid. In flow boiling, the liquid's motion significantly affects the heat transfer process. The flow velocity, flow regime, and quality of the boiling liquid can impact the overall heat transfer rates. Flow boiling is commonly observed in industrial processes involving heat exchangers and refrigeration systems.

Enhancing Boiling Heat Transfer Efficiency

Now that we have explored the fundamental and sub-phenomena of boiling heat transfer, it is essential to highlight some strategies to enhance its efficiency.

One approach is to modify the surface characteristics to improve nucleation and bubble departure. Surface coatings, nanostructures, and microcavities are being explored to promote bubble formation and minimize thermal resistance at the solid-liquid interface.

Another strategy involves optimizing the flow conditions to enhance vapor removal. Proper design of flow channels and configurations, along with the selection of appropriate working fluids, can significantly enhance heat transfer efficiency.

The world of boiling heat transfer is both fascinating and complex, with its fundamental principles and sub-phenomena intertwining to create an intricate heat transfer process. By understanding these mechanisms and employing strategies to enhance efficiency, we can unlock new possibilities in various industries, leading to improved energy usage and sustainable development.

References:

1. Incropera, F. P., DeWitt, D. P., Bergman, T. L., & Lavine, A. S. (2006). to Heat Transfer. John Wiley & Sons.

2. Kandlikar, S. G. (2013). Heat transfer phenomena and applications. CRC Press.

Boiling Process: Fundamental And Sub Phenomenon Of Boiling Heat Transfer
by Kung Linliu (Kindle Edition)

5 out of 5

Language : English
File size : 481 KB
Text-to-Speech : Enabled
Screen Reader : Supported
Enhanced typesetting : Enabled
Word Wise : Enabled
Print length : 74 pages
Lending : Enabled
Paperback : 50 pages
Item Weight : 3.68 ounces
Dimensions : 5 x 0.12 x 8 inches

Boiling heat transfer plays an important role in a range of technological and industrial applications such as refrigeration, heat exchangers, cooling of high-power electronics, and nuclear reactors.
This book provides knowledge of boiling in a very simple language.
This book explains different types of boiling like Pool Boiling and Flow Boiling.

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