KNOWN: Hand experiencing convection heat transfer with moving air and water.
FIND: Determine which condition feels colder. Contrast these results with a heat loss of 30W/m2 under normal room conditions.
ASSUMPTIONS: 1) Temperature is uniform over the hand's surface
2) Convection coefficient is uniform over the hand
3) Negligible radiation exchange between hand and surroundings in the case of air flow
ANALYSIS: The hand will feel colder for the conditions which results in the larger heat loss. The Heat loss can be determined from Newton's law of cooling.
Calculation Reference
Fundamentals of Heat and Mass Transfer - Frank P. Incropera
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