Typical Heat Transfer Coefficients of Common Materials
Typical Heat Transfer Coefficients of Common Materials
(OP)
I am attempting to perform some heat convection calculations on a process with a granular, rubber-type material but don't have the heat transfer coefficient for the material. I figure I could complete my calculations if I was able to find a list of heat transfer coefficients for common materials. Does anyone know where such a list exists online?





RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
TTFN
RE: Typical Heat Transfer Coefficients of Common Materials
To cltengr, convection involves movement. Thus, it can not be a property of the static exposed solid. You are right in that cooler air may improve the htc over ambient air.
The htc, h, W/(m2.oC) can be approximated for turbulent air in free convection (Gr/Re2> 1.0) over a horizontal surface by
where Δt is in oC
Since, apparently, the process would be of unsteady state heat transfer, with changing Δt, the value of h is bound to drop with time.
RE: Typical Heat Transfer Coefficients of Common Materials
Your "rubbery" material is like a thermal insulator, therefore, you're ultimately limited by your material's thermal conductivity and heat capacity.
TTFN
RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
conduction: q = -k*A*(dT/dx)
convection: q = h*A*(deltaT)
based on the way the original question was worded, I had assumed that the OP wanted conductivity, not a convective htc.
RE: Typical Heat Transfer Coefficients of Common Materials
That can only be rationally interpreted as requiring a thermal conductivity, since the convective heat transfer coefficient is a function of fluid, not the immersed material.
TTFN
RE: Typical Heat Transfer Coefficients of Common Materials
RE: Typical Heat Transfer Coefficients of Common Materials
TTFN
RE: Typical Heat Transfer Coefficients of Common Materials
These are film coefficients. All units are W/m^2-K
Free convection
air 5-20
water 100-600
Forced convection
air 10-100
water 500-10,000