# Nusseltforced: Nusselt number for forced convection. In Thermimage: Thermal Image Analysis

## Description

Nusselt number for forced convection. Used in estimating convective heat loss. Typical values of c and n are 0.24 and 0.6, respectively. This function sets c and n to NULL to force shape calculation checks.

## Usage

 `1` ```Nusseltforced(c = NULL, n = NULL, V = 1, L = 0.1, Ta = 20, shape="hcylinder") ```

## Arguments

 `c` coefficient used in calculating Nusselt number. Default is NULL `n` coefficient used in calculating Nusselt number. Default is NULL `V` Air velocity in metres/second. Used in call to Reynolds(). Default value is 1. `L` Characteristic dimension in metres. Default value is 0.1. `Ta` Air temperature in degrees celsius. Used in call to Reynolds(). `shape` "sphere", "hplate", "vplate", "hcylinder", "vcylinder" to denote shape and orientation. h=horizontal, v=vertical. Default shape is "hcylinder"

## Author(s)

Glenn J Tattersall

## References

Gates, DM. 2003. Biophysical Ecology. Dover Publications, Mineola, New York, 611 pp. Blaxter, K. 1989. Energy Metabolism in Animals and Man

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15``` ```## The function is currently defined as function (c = NULL, n = NULL, V = 1, L = 0.1, Ta = 20, shape="hcylinder") { Nu <- c * Reynolds(V, L, Ta)^n Nu } # Example # Usually called from the hconv() or qconv() functions V<-1 L<-0.1 Ta<-20 shape="hcylinder" Nu<-Nusseltforced(V=V, L=L, Ta=Ta, shape=shape) ```

Thermimage documentation built on Nov. 6, 2018, 1:03 a.m.