- Gap filling (18×1 score=18 score) and 1. The foundation for derivation of the differential equation of heat conduction

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Gap Filling 18 1 Score 18 Score And 1 The Foundation For Derivation Of The Differential Equation Of Heat Conduction 1 (39.56 KiB) Viewed 29 times

- Gap filling (18×1 score=18 score) and 1. The foundation for derivation of the differential equation of heat conduction is In the cartesian coordinate system, the one-dimensional differential equation of heat conduction, unsteady and without internal heat source can be expressed as 2.For a three-layer flat wall composed of different materials, the temperature field of the steady-state heat conduction is shown in the figure below, the wall thicknesses are equal, and the relationship of the thermal conductivities of each layer is |||| 3. According to the condensation form, the condensation can be classified as condensation and condensation, and thermal resistance. 4. The two main characteristics of gas radiation are and 5. A square channel is infinitely long in the vertical direction of the paper surface. please determine the view factor of the two adjacent sides as and the view factor of the two opposite sides as condensation with a larger 6. A heat exchanger with the overall heat transfer coefficient of 200 W/(m²-K) initially. After one year of operation, the heat transfer coefficient is dropped to 150 W/(m²-K) due to fouling, the thermal resistance due to fouling is 7. The flue gas temperature in the furnace is measured by the exposed thermocouple as t, the actual flue gas temperature in the furnace is t, and the inner wall temperature of the furnace is, then the magnitude relationship between them is 8. In solving unsteady conduction problem, the criteria number for determining whether lumped system method can be used is 9. As the fluid flows through the bend pipe, the convective heat transfer coefficient will (increase, decrease or not change). 10. The black body radiation obeys the wavelength, and obeys the law subject to the distribution of law subject to the spatial distribution. The 2/4 relationship between the wavelength for maximum spectral radiation power and temperature obeys law.