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Mechanism of heat transfer

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...

Mechanisms of Heat Transfer II

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...

Mechanisms of Heat Transfer I

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.

Mechanisms of Heat Transfer

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.

Thermosensation

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...

Heat Flow and Specific Heat

Heat Flow and Specific Heat

Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is the kilocalorie...

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Related Experiment Video

Updated: Jun 12, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Integrated-optic fluid sensor using heat transfer.

A Enokihara, M Zutsu, T Sueta

|June 5, 2010

Summary

This summary is machine-generated.

This study introduces an integrated-optic fluid sensor that uses heat transfer to measure fluid properties. Experiments confirmed its performance for humidity sensing using a lithium niobate waveguide.

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Published on: June 3, 2015

Area of Science:

Optoelectronics
Integrated Optics
Chemical Sensing

Background:

Traditional fluid property sensors often face limitations in sensitivity and integration.
Optical sensing offers a promising alternative due to its non-intrusive nature and potential for miniaturization.

Purpose of the Study:

To propose and demonstrate an integrated-optic fluid sensor based on the heat-transfer phenomenon.
To explore the sensor's potential for measuring rarefied gas pressure and air humidity.

Main Methods:

Utilizing an optical waveguide interferometer to convert surface temperature variations into light intensity signals.
Employing a steady heating substrate to induce temperature changes based on fluid properties.
Conducting a humidity sensing experiment with a lithium niobate (LiNbO3) waveguide.

Main Results:

The sensor effectively converts temperature changes, influenced by fluid properties, into measurable optical signals.
Experimental validation confirmed the basic performance of the device for humidity sensing.
The proposed sensor shows potential for measuring rarefied gas pressure and air humidity.

Conclusions:

The integrated-optic fluid sensor demonstrates a viable approach for non-intrusive fluid property measurement.
The heat-transfer mechanism combined with optical interferometry offers a sensitive and adaptable sensing platform.
Further development could lead to advanced sensors for environmental monitoring and industrial process control.