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CASTLE DEFENSE By Clayton Nylander and Amy Gordon.

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Presentation on theme: "CASTLE DEFENSE By Clayton Nylander and Amy Gordon."— Presentation transcript:

1 CASTLE DEFENSE By Clayton Nylander and Amy Gordon

2 Questions to be answered 1. How much will pouring hot oil/water really hurt? 2. Which type of armor protects you best? 3. What conditions would cause the liquid to be cooled?

3 Background  Machicolations were holes through which boiling liquids (water, oil, pitch) were poured  Castle walls typically ft high

4 1. How much will pouring hot oil/water really hurt?  Assumptions Forced convection over flat plate Liquid travels through holes, so flow has tight diameter (0.04m) 20 m drop Neglect evaporation (evaporation would decrease final temperature)  Fundamental Relationships

5 1. How much will pouring hot oil/water really hurt?  Temperature at bottom of fall (beginning at boiling temp) Water, Tbottom: K Oil, Tbottom: K  Conclusion: Third degree burns occur instantaneously without protection

6 2. Will any type of armor save you more than the other? Heat transfer due to free convection regarded negligible  Fundamental Relationships

7 2. Will any type of armor save you more than the other?  Water Leather (0.005 m thickness) T i = K Steel (0.002 m thickness) T i = K  Oil Leather (0.005 m thickness) T i = K Steel (0.002 m thickness) T i = K  Conclusion: Leather is better protection against boiling liquid

8 3. What conditions would cause the liquid to be cooled?  Increase Height Water At 20 m, T bottom = K At 200 m, T bottom = K Oil At 20 m, T bottom = K At 200 m, T bottom = K  Conclusion: Cooling is not enhanced, even after absurdly large distances.

9 3. What conditions would cause the liquid to be cooled?  A windy or extra cold day  Cooling of liquid before pouring  Scattering of droplets  Evaporation

10 References  ecific_weights.htm    unset.jpg  ml/ahd4/Machicolations/machic


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