**Last Updated: 6/15/2018**

(Fluid Mechanics,
PDE's, Thermodynamics and Numerical
Methods, too)

**Two-Dimensional, Steady-State Conduction ****(Updated: 3/6/2018)**

This workbook evaluates the analytical solution for steady-state conduction in a unit square with one boundary held at a different temperature than the other three and returns a raised contour plot of the results. This particular problem is used frequently to demonstrate separation-of-variables as a solution technique for PDE's. The user can change the number of terms to be included in the evaluation of the infinite series. A new, second worksheet animates the process of adding terms to the series. Quite a few are needed in this particular problem to get a good solution here - because of the discontinuity at two of the corners and the animation shows the Gibbs phenomenon clearly. This workbook was updated in April 2013 to work better in more recent editions of Excel.

**Periodic Conduction in a Semi-Infinite Body ****(Updated: 3/6/2018)**

This one "animates" the analytical solution for transient conduction in a semi-infinite body subject to a periodically varying temperature at the exposed face. The input parameters used for the plot shown correspond to the annual temperature cycle in the ground (about 3x10E7 seconds), but may be readily changed.

**Planck's Law ****(Updated: 3/13/2018)**

This
workbook computes and displays the spectral blackbody emissive power for a
number of source temperatures. This new version also allows the user to display
the spectral blackbody emissive power for a particular temperature and
evaluates the integral over a wavelength range selected by the user
(replicating the tabulated blackbody radiation functions). (See the
cyan-colored lines in the figure below.) Another sheet is this workbook
includes tabulated data for the spectral transmissivity of two types of glass,
one of them a standard glass, the other a "low-E" (low-emissivity)
glass. The function for blackbody emissive power, this tabulated data and
Simpson's Rule may be used to find the total transmissivity of the two
glasses. This new version has
been updated to run better in newer versions of Excel.

**Radiation View Factors ****(Updated: 3/7/2018)**** **

**Air-Water Properties ****(Updated: 3/2/2018)**** **

Five state
and transport properties of air and seven of water, all of which are functions
of temperature, are included in this module. These user-defined functions may
be invoked in a worksheet exactly as are the supplied functions (sine, cosine,
sum, etc.) and allow the design engineer to do multiple calculations readily
without cumbersome table lookups. These functions were developed for use in the
Sweaty Runner and Lister Bag projects. A discussion of the former
project assignment may be found in: Ribando, R.J. and Galbis-Reig,
V., "Convective Heat and Mass Transfer from a Runner Using Some Modern
Spreadsheet Features," *Computers in Education Journal,* Vol. VIII,
No. 4, Oct. - Dec. 1998, pp. 22-28.

As with all items in the HTT software collection, the user is urged to verify the accuracy of these property functions before using them. The NIST Chemistry WebBook is an excellent resource.

**Solution of Blasius Equation ****(Updated: 3/2/2018)**

**Internal-Flow Convection Correlations ****(Updated: 3/7/2018) **

This
workbook computes the Nusselt number for forced convection in a circular pipe
as a function of the Reynolds (based on diameter) and Prandtl numbers (and
where appropriate one or two other parameters). It includes subroutines for
laminar, transition and turbulent flows, and for liquid metals. Results for a
range of Reynolds and Prandtl numbers are show in this plot. This spreadsheet
was developed to aid in verifying our internal flow
module

**Iteration
Demonstrations ****(Updated:
2/22/2018) **

This
workbook includes three separate demonstrations of Gauss-Seidel (Liebmann) iteration for the solution of systems of linear
equations. The first one, shown in the figure, demonstrates using G-S to solve
the system of linear equations arising from the finite-difference
discretization of

**Advection
of a Passive Scalar in One and Two Dimensions ****(Updated: 3/20/2018) **

**Projectile Motion with Air Resistance ****(Updated: 3/14/2018) **

**Elliptic Grid Generation ****(Updated: 3/20/2018) **

**One-Dimensional Compressible Flows ****(Updated: 3/14/2018) **

This
first workbook includes worksheets for: (1) Isentropic flow with area change,
(2)

The
second workbook is for oblique, planar shocks. The user will have to become familiar
with Excel’s Solver Add-in in order to use this workbook.

**Vortex
Panel Method (Updated: 3/6/2018) **

This
workbook implements the vortex panel method for a lifting airfoil. It closely follows the algorithm
in Kuethe and Chow (1986).

**Vortex Motion above a Runway ****(Updated: 3/6/2018) **

**1976 U.S. Standard Atmosphere
****(Updated: 3/20/2018) **

**One-dimensional Wave Equation ****(Updated: 4/3/2018) **

**Velocity
Triangles for Turbomachinery ****(New 6/4/2018) **

**Solution
of Linear Equations ****(Updated:
2/22/2018) **

The
first part of this spreadsheet is an exact implementation of the procedure
discussed on page 155 of *Engineering with Excel*, 2nd Edition, by
Ronald W. Larsen, Prentice-Hall E-Source (2005). A 3x3 system of linear
equations is solved using the Excel MINVERSE function for the inverse of a
matrix. The second part uses a home-made VBA subroutine to accomplish the same
thing.

**Brayton Cycle****
Gas Turbine Cycle Template (Updated 3/22/2018) – with sound and
regeneration!**

**Rankine Cycle**** ****Steam
Turbine Cycle Template (Updated 3/22/2018)**

**Otto Cycle****
Spark-ignition, Internal Combustion Engine Template (Updated 3/27/2018) –
with round sound!**

**Diesel Cycle****
Compression-ignition, Internal Combustion Engine Template (Updated 3/15/2018) **

**Vapor Compression Refrigeration Cycle** ** Reverse of Rankine Cycle – used for
refrigeration. (New 4/2/2018) **

**HTTdemosub.xlsm
A spreadsheet demonstrating a lot of features of Excel and VBA (Updated
3/7/2018) **

** **This one includes buttons, scrollbars,
functions, subroutines, named ranges and even narration.

**General Reference on Use of
VBA with Excel (VBAPrimer.pdf) – Updated
6/4/2018:**

Ribando,
R.J., "An Excel/Visual Basic for Applications (VBA) Primer," *Computers
in Education Journal*, Vol. VIII, No. 2, April-June 1998, pp. 38-43. A
version of this article updated for Excel 2007 and newer may be found here.

**Greeting Cards**** Excel/VBA Greeting Cards for Halloween,
Valentine’s Day, Thanksgiving and Groundhog Day **

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