---
author: Akbar Rahman
date: \today
title: MMME2047 // Heat Transfer
tags: [ heat_transfer ]
uuid: d3ba66c2-e486-464a-a4df-f23f2155ee6d
lecture_slides: [ ./lecture_slides/6ConvHeatTransfer-without-written-comments.pptx ]
lecture_notes: [ ./lecture_notes/ConvectHeatTrans2022-2023.pdf ]
exercise_sheets: [ ./exercise_sheets/ExamplesConvectionHeatTransfer.pdf ]
---

# Convection

- conduction and radiation heat transfer can be estimated by calculations and properties
- convection is dependent on fluid properties, flow type, and flow characteristics

The rate of convective heat transfer, $\dot Q$, is given by

\begin{equation}
\dot Q = hA(T_f-T_w)
\label{eqn:convectionheattransfer}
\end{equation}

where $T_w$ is the wall temperature, $T_f$ is the fluid temperature, $A$ is the area of heat flow,
and $h$ is the heat transfer coefficient.

## Thermal Resistance

Equation \ref{eqn:convectionheattransfer} can also be expressed in terms of thermal resistance, $R_\text{thermal}$:

$$\dot Q = \frac{T_f-T_w}{\sum R_\text{thermal}}$$

where $R_\text{thermal} = \frac{1}{hA}$.

In a way this analogous to Ohm's law, specifically with resistors in series ($I = \frac{\Delta V}{\sum R_\text{electrical}}$).