In an annealing process, a 50-mm-thick stainless steel plate (Ï = 8238 kg/m 3 , c p
Question:
(a) Table 182
(b) the Heisler chart (Figure 1814).
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TABLE 18-2 Coefficients used in the one-term approximate solution of transient one- dimensional heat conduction in plane walls, cylinders, and spheres (Bi = HLIK for a plane wall of thickness 2L, and Bi = radius r) hrjk for a cylinder or sphere of Plane Wall Cylinder Sphere A1 Bi A1 λι λι 1.0017 1.0030 0.01 0.0998 0.1412 1.0025 0.1730 0.02 0.1410 1.0033 0.2445 0.1995 1.0050 1.0060 1.0066 1.0099 0.04 0.1987 0.2814 0.3450 1.0120 0.4217 0.06 0.2425 1.0098 0.3438 1.0148 1.0179 0.08 0.2791 1.0130 0.3960 1.0197 0.4860 1.0239 0.5423 0.1 0.3111 1.0161 0.4417 1.0246 1.0298 0.4328 0.5218 0.2 1.0311 0.6170 1.0483 0.7593 1.0592 0.3 1.0450 1.0580 0.7465 1.0712 0.9208 1.0880 0.8516 0.4 0.5932 1.0931 1.0528 1.1164 1.1656 0.5 0.6533 1.0701 0.9408 1.1143 1.1441 0.6 0.7051 1.0814 1.0184 1.1345 1.2644 1.1713 0.7 0.7506 1.0918 1.0873 1.1539 1.3525 1.1978 0.8 0.7910 1.1016 1.1490 1.1724 1.4320 1.2236 0.9 1.1902 0.8274 1.1107 1.2048 1.5044 1.2488 1.0 0.8603 1.1191 1.2558 1.2071 1.5708 1.2732 2.0288 2.0 1.0769 1.1785 1.5995 1.3384 1.4793 1.2102 3.0 1.1925 1.7887 1.4191 2.2889 1.6227 4.0 1.2646 1.2287 1.9081 1.4698 2.4556 1.7202 5.0 1.3138 1.2403 1.9898 1.5029 2.5704 1.7870 6.0 1.3496 1.2479 2.0490 1.5253 2.6537 1.8338 7.0 1.3766 1.2532 2.0937 1.5411 2.7165 1.8673 8.0 1.3978 1.2570 2.1286 1.5526 2.7654 1.8920 1.2598 9.0 1.4149 2.1566 1.5611 2.8044 1.9106 1.9249 10.0 1.4289 1.2620 2.1795 1.5677 2.8363 20.0 1.4961 1.2699 2.2880 1.5919 2.9857 1.9781 1.9898 30.0 1.5202 1.2717 2.3261 1.5973 3.0372 40.0 1.5325 1.2723 2.3455 1.5993 3.0632 1.9942 2.3572 50.0 1.5400 1.2727 1.6002 3.0788 1.9962 100.0 1.5552 1.2731 2.3809 1.6015 3.1102 1.9990 1.6021 1.5708 1.2732 2.4048 3.1416 2.0000 Cylinder 1.0 0.7 0.5 0.4 hro 0.3 0.2 16 80 70 0.1 0.07 0.05 0.04 0.03 0.02 0.01 0.007 0.005 0.004 0.003 0.002 250 350 100 120 140 150 26 30 50 70 14 18 22 0.001 2 3 4 6 8 10 T= at/r? e60 50 40
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Related Book For
Fundamentals of Thermal-Fluid Sciences
ISBN: 978-0078027680
5th edition
Authors: Yunus A. Cengel, Robert H. Turner, John M. Cimbala
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Conduction heat transfer is the transfer of heat through matter (i.e., solids, liquids, or gases) without bulk motion of the matter. In another ward, conduction is the transfer of energy from the more energetic to less energetic particles of a substance due to interaction between the particles. Conduction heat transfer in gases and liquids is due to the collisions and diffusion of the molecules during their random motion.
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