full2010.pdf - page 1472

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Ÿ¨„µ¦ª·‹´¥Â¨³°£· ž¦µ¥Ÿ¨
Reynold number
0 1000 2000 3000 4000
Heat transfer coefficient (kW/m
2K)
0
5
10
15
20
25
30
15
23
30
Heat flux: kW/m2
Mulltiport minichannel
Dh = 1.2 mm,
T cw,in = 15 oC
(a)
Reynold number
0 1000 2000 3000 4000
Heat transfer coefficient (kW/m
2K)
0
10
20
30
40
20
26
30
Heat flux: kW/m2
Mulltiport minichannel
Dh = 1.2 mm,
Tcw,in = 20 oC
(b)
£µ¡š¸É 3. (a) ¨³ (b) „¦µ¢Â—Š‡ªµ¤´¤¡´œ›r¦³®ªnµŠ‡n µ Reynolds number „´‡nµ´¤ž¦³·š›·Í„µ¦™nµ¥Áš‡ªµ¤
¦o°œš¸É¢¨´„Žr‡ªµ¤¦o°œ˜nµŠÇ
£µ¡š¸É 3 (a) ¨³ (b) Áž} œ„¦µ¢Â—Š‡ªµ¤´¤¡´œ›r¦³®ªnµŠ‡nµ Reynolds number „´‡nµ´¤ž¦³· š›·Í„µ¦
™nµ¥Áš‡ªµ¤¦o°œ (Heat transfer coefficient) 宦´ šn° œµ—Á¨È„®¨µ¥n°ŠšµŠš¸É°»–®£¼¤·œÊÎ µÁ¥ÈœšµŠÁ oµÁšnµ„´ 15 oC
¨³20 oC ˜µ¤¨Îµ—´ Ž¹ÉŠ‹³¡ªnµ ‡nµ Reynolds number š¸ÉÁ¡·É¤ ¹Êœ¤¸Ÿ¨˜n°„µ¦Áž¨¸É¥œÂž¨Š °Š‡nµ´¤ž¦³· š›·Í„µ¦
™nµ¥Áš‡ªµ¤¦o°œœo°¥¤µ„ ˜n‡nµ´¤ž¦³·š›·Í„µ¦™nµ¥Áš‡ªµ¤¦o°œ¤¸‡nµÁž¨¸É ¥œÂž¨ŠÁ¡·É¤ ¹Êœ°¥nµŠ´—Á‹œ˜µ¤°´ ˜¦µ„µ¦
Á¡·É¤ °Š¢¨´ „Žr‡ªµ¤¦o °œ (Heat flux)