The document analyzes heat transfer in aerospace applications. The objective is to analyze heat transfer behavior to obtain performance of thermal protection systems by researching materials with different thermal properties. It discusses how heat is transferred between objects at different temperatures according to the zeroth law of thermodynamics and heat capacity. The problem describes designing a thermal protection system that must withstand 5 minutes of exposure at temperatures below the material's melting point and 310K on the back wall. Alusil alloy is chosen as the material due to its properties including density, specific heat, thermal conductivity, and diffusivity. Graphs show temperature over time and heat flow for the system.

1. Heat Transfer in
Aerospace Applications
“Técnicas computacionales en aeronáutica” Class 2018
Jocelyn Crespo Camacho
Josué Jesús Díaz Beltrán
Irving Mitchell Estrada Garibaldi
Andrés Antonio Vales Ramírez
October 2018

2. OBJECTIVE: Analyze the heat transfer behavior in order
to obtain the performance of a thermal protection
system, realizing a research of several different materials
with different thermal properties.

3. The zeroth law of Thermodynamics introduces the concept of thermodynamic equilibrium, in
which two objects have the same temperature. If we bring two objects that are initially at
different temperatures into physical contact, they eventually achieve thermal equilibrium.
The Zeroth Law of Thermodynamics introduces the concept of thermodynamic equilibrium, in
which two objects have the same temperature. If we bring two objects that are initially at
different temperatures into physical contact, they eventually achieve thermal equilibrium. During
the process of reaching thermal equilibrium, heat is transferred between the objects. The amount
of heat transferred delta Q is proportional to the temperature difference delta T between the
objects and the heat capacity c of the object.
The heat capacity is a constant that tells how much heat is added per unit temperature rise. The
value of the constant is different for different materials. Heat is always transferred from the
object at the higher temperature to the object with the lower temperature.
https://www.grc.nasa.gov/www/k-12/airplane/heat.html

4. PROBLEM DESCRIPTION
Design a Thermal protection system with the following properties,
• Total time of exposure is 5 min, 300 s.
• Temperature of TPS material cannot exceed its melting temperature.
• Temperature on the back wall of TPS cannot exceed 310 K, so that the base plate can
always be found to be at a temperature pretty close to temperature of human body.
• Total weight per square meter of frontal surface needs to be minimized.
Your TPS system is as shown in the figure,

5. MATERIAL
The material chosen was Alusil. Alusil as a hypereutectic aluminium-silicon alloy (EN AC-
AlSi17Cu4Mg / EN AC-48100 or A390) contains approximately 78% aluminium and 17%
silicon. This alloy was created in 1927 by Schweizer & Fehrenbach of Baden-Baden Germany
and further developed by Kolbenschmidt.
The Alusil aluminium alloy is commonly used to make linerless aluminium alloy engine
blocks.
Properties:
Material Density (kg/m3) Specific Heat
(C)
Thermal Conductivity Thermal
Diffusivity (𝛼)
Minimum
Thickness (m)
Mass/area (kg/m2)
Alusil 2627 854 161 7,172 0.01 26.27
http://materias.fi.uba.ar/6731/Tablas/Tabla5.pdf

6. TEMPERATURE VS TIME

7. HEAT FLOW