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Leidenfrost effect. A water drop will last about 1 s on a hot skillet with a temperature •62 Water drop Skillet between 100°C and about 200°C. However, if the skillet is much hot- Figure 18-48 Problem 62. ter, the drop can last several min- utes, an effect named after an early investigator. The longer lifetime is due to the support of a thin layer of air and water vapor that sepa- rates the drop from the metal (by distance L in Fig. 18-48). Let L = 0.100 mm, and assume that the drop is flat with height h =1.50 mm and bottom face area A = 4.00 x 10-6 m?. Also assume that the skillet has a constant temperature T,= 300°C and the drop has a temperature of 100°C. Water has density p= 1000 kg/m³, and the supporting layer has thermal conductivity k = 0.026 W/m-K. (a) At what rate is energy conducted from the skillet to the drop through the drop's bottom surface? (b) If conduction is the primary way en- ergy moves from the skillet to the drop, how long will the drop last?

Leidenfrost effect. A water drop will last about 1 s on a hot skillet with a temperature •62 Water drop Skillet between 100°C and about 200°C. However, if the skillet is much hot- Figure 18-48 Problem 62. ter, the drop can last several min- utes, an effect named after an early investigator. The longer lifetime is due to the support of a thin layer of air and water vapor that sepa- rates the drop from the metal (by distance L in Fig. 18-48). Let L = 0.100 mm, and assume that the drop is flat with height h =1.50 mm and bottom face area A = 4.00 x 10-6 m?. Also assume that the skillet has a constant temperature T,= 300°C and the drop has a temperature of 100°C. Water has density p= 1000 kg/m³, and the supporting layer has thermal conductivity k = 0.026 W/m-K. (a) At what rate is energy conducted from the skillet to the drop through the drop's bottom surface? (b) If conduction is the primary way en- ergy moves from the skillet to the drop, how long will the drop last?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Leidenfrost effect. A water drop will last about 1 s on a hot skillet with a temperature •62 Water drop Skillet between 100°C and about 200°C. However, if the skillet is much hot- Figure 18-48 Problem 62. ter, the drop can last several min- utes, an effect named after an early investigator. The longer lifetime is due to the support of a thin layer of air and water vapor that sepa- rates the drop from the metal (by distance L in Fig. 18-48). Let L = 0.100 mm, and assume that the drop is flat with height h =1.50 mm and bottom face area A = 4.00 x 10-6 m?. Also assume that the skillet has a constant temperature T,= 300°C and the drop has a temperature of 100°C. Water has density p= 1000 kg/m³, and the supporting layer has thermal conductivity k = 0.026 W/m-K. (a) At what rate is energy conducted from the skillet to the drop through the drop's bottom surface? (b) If conduction is the primary way en- ergy moves from the skillet to the drop, how long will the drop last?
Transcribed Image Text:Leidenfrost effect. A water drop will last about 1 s on a hot skillet with a temperature •62 Water drop Skillet between 100°C and about 200°C. However, if the skillet is much hot- Figure 18-48 Problem 62. ter, the drop can last several min- utes, an effect named after an early investigator. The longer lifetime is due to the support of a thin layer of air and water vapor that sepa- rates the drop from the metal (by distance L in Fig. 18-48). Let L = 0.100 mm, and assume that the drop is flat with height h =1.50 mm and bottom face area A = 4.00 x 10-6 m?. Also assume that the skillet has a constant temperature T,= 300°C and the drop has a temperature of 100°C. Water has density p= 1000 kg/m³, and the supporting layer has thermal conductivity k = 0.026 W/m-K. (a) At what rate is energy conducted from the skillet to the drop through the drop's bottom surface? (b) If conduction is the primary way en- ergy moves from the skillet to the drop, how long will the drop last?
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