Modeling Natural Convection Cooling of a Vacuum Flask in COMSOL
Natural Convection Cooling of a
Vacuum Flask
COMSOL
Introduction
This example solves a pure conduction problem and a free-convection problem in which a
vacuum flask holding hot coffee dissipates thermal energy
The main interest is to calculate the flask’s cooling power; that is, how much heat it loses
per unit time
The coffee has an initial temperature of 90°C and cools down over time
The observation period is 10 h
This tutorial compares two different approaches to model natural convection cooling:
‒
Using heat transfer coefficients to describe the thermal dissipation
‒
Modeling the convective flow of air outside the flask to describe the thermal dissipation
Model Definition
Geometry 1
Model Definition
Heat Transfer in Solids
Model Definition
Geometry 2
Model Definition
Heat Transfer in Solids and Fluids 2
Model Definition
Laminar Flow
Results
Temperature results for the model including the fluid flow
Results
Isothermal domain temperature over time for both approaches
Results
Heat transfer coefficient along the vertical flask walls. Blue line: modeling
approach using the heat transfer coefficient library, green line: modeling
approach including the fluid flow
Results
Fluid velocity for air around the flask
This example demonstrates the modeling of natural convection cooling in a vacuum flask holding hot coffee using COMSOL. It compares two approaches to describe thermal dissipation, focusing on calculating the flask's cooling power over time. Results include temperature analysis, heat transfer coefficients, and fluid flow simulations.
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Presentation Transcript
Natural Convection Cooling of a Vacuum Flask COMSOL
Introduction This example solves a pure conduction problem and a free-convection problem in which a vacuum flask holding hot coffee dissipates thermal energy The main interest is to calculate the flask s cooling power; that is, how much heat it loses per unit time The coffee has an initial temperature of 90 C and cools down over time The observation period is 10 h This tutorial compares two different approaches to model natural convection cooling: Using heat transfer coefficients to describe the thermal dissipation Modeling the convective flow of air outside the flask to describe the thermal dissipation
Model Definition Geometry 1
Model Definition Heat Transfer in Solids
Model Definition Geometry 2
Model Definition Heat Transfer in Solids and Fluids 2
Model Definition Laminar Flow
Results Temperature results for the model including the fluid flow
Results Isothermal domain temperature over time for both approaches
Results Heat transfer coefficient along the vertical flask walls. Blue line: modeling approach using the heat transfer coefficient library, green line: modeling approach including the fluid flow
Results Fluid velocity for air around the flask
