host various "Solutions to Numerical Heat Transfer" documents, though some may be in languages other than English (e.g., Persian). ResearchGate Top Alternative Books with Official Manuals
Steps:
no official instructor's solution manual was ever publicly released by the original publishers.
There is no standard instructor's manual available through CRC Press or Taylor & Francis.
Mastering Computational Basics: The Legacy of Patankar’s Solution Manual For over four decades, Suhas V. Patankar’s Numerical Heat Transfer and Fluid Flow