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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...

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...

Physical Methods for Controlling Microbial Growth: Temperature

Physical Methods for Controlling Microbial Growth: Temperature

Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...

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.

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...

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.

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Updated: Nov 18, 2025

Optimization of the Epimedii Folium Mutton-Oil Processing Technology and Testing Its Effect on Zebrafish Embryonic Development

Optimization of the Epimedii Folium Mutton-Oil Processing Technology and Testing Its Effect on Zebrafish Embryonic Development

Published on: March 17, 2023

Recent advances in physical fields-based frying techniques for enhanced efficiency and quality attributes.

Ya Su¹, Jiayue Gao¹, Song Tang²

¹School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing, Jiangsu, China.

Critical Reviews in Food Science and Nutrition

|February 10, 2021

Summary

Applying physical fields like pressure, electromagnetic, and acoustic fields enhances traditional frying. These advanced methods improve efficiency and food quality, offering promising commercial prospects.

Keywords:

Efficiency frying microwave physical fields quality ultrasound

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Author Spotlight: Optimization of Processing Technology for Tiebangchui with Zanba Based on CRITIC Combined with Box-Behnken Response Surface Method

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Area of Science:

Food Science and Technology
Chemical Engineering
Materials Science

Background:

Traditional frying faces challenges like low thermal efficiency and processing effectiveness.
Frying involves complex physicochemical and structural transformations in food.

Purpose of the Study:

To review the application of physical fields in enhancing frying technology.
To discuss the impact of physical fields on heat/mass transfer and food microstructure.
To explore synergistic effects and future trends in multi-physical field frying.

Main Methods:

Review of literature on applying pressure, electromagnetic, and acoustic fields in frying.
Analysis of modifications in heat and mass transfer mechanisms.
Examination of effects on moisture loss, oil uptake, texture, color, and nutrient retention.

Main Results:

Physical fields significantly alter heat and mass transfer dynamics during frying.
Optimized processing parameters improve moisture loss kinetics and reduce oil uptake.
Enhanced texture, color, and nutrient retention are observed with physical field application.

Conclusions:

Multi-physical field-based frying offers synergistic benefits for improved efficiency and quality.
Further development requires addressing technical complexities and economic costs.
Physical fields provide innovative approaches for efficient, high-quality frying technologies.