These online calculation pages implement heat transfer models developed by the Microelectronics Heat Transfer Laboratory at the University of Waterloo. These models are accessed through a CGI interface and require the use of a forms-capable browser. New models will be added to this site as soon as they are completed.

- NEW!
**WebMETA Online Demo**

Based on the successful META (MicroElectronic Thermal Analyzer) program, this application allows the user to define a circuit board, then outputs graphs of temperature, velocity, heat flux and more. This demo has limited features, but is fully functional. Must have Netscape 4.0 or greater. - Under Construction!
**Effective Conductivity Model for Rectangular Heat Sources**

This model predicts effective conductivity from a rectangular heat source, based on the composition of the substrate and boundary conditions on the source. Must use Netscape 3.0 or greater. -
**Natural Convection Model for Circular and Square-Finned Annular Heat Sinks**

Based on the Ph.D. research of C.S. Wang, this model predicts heat transfer from natural convection horizontal annular heat sinks. The online model incorporates both fin efficiency and radiation functions. -
**Natural Convection Model for Rectangular Heat Sinks**

This model predicts heat transfer from natural convection rectangular heat sinks. The online model incorporates a fin efficiency function, and allows for both single and back-to-back configurations. -
**Thermal Fluid Properties Calculator**

Properties of air, Ar, N_{2}and H_{2}calculated based on correlations developed by F McQuillan. Properties of CO_{2}, H_{2}O(*l*) and the ethylene glycols are based on the correlations developed by Tom Lemczyk. The calculator takes the temperature of the fluid as input and outputs an array of properties at 1 atm. -
**Special Functions Calculator**

Calculates special mathematical functions, including Gaussian error and complementary error functions, gamma functions, and Bessel functions of integer or fraction order -
**Spreading Resistance Calculator for Circular Sources on Compound and Isotropic Disks**

Calculates the thermal spreading resistance for a circular source on an isotropic and two-layer circular disk, semi-infinite circular cylinder, or half space. -
**Spreading Resistance Calculator for Isoflux Rectangles and Strips on Compound Flux Channels**

Calculates two- and three-dimensional thermal spreading resistance for isoflux rectangular and strip sources on an isotropic and two-layer rectangular disk, a semi-infinite rectangular cylinder, or half space.

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