Thermimage (version 4.0.1)

Nusseltforced: Nusselt number for forced convection.

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

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"

References

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

Examples

# NOT RUN {
## 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)

# }