ech%203264_exam1_Sp06

ech%203264_exam1_Sp06 - ECH 3264: Spring 2006 Exam #1...

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ECH 3264: Elementary Transport Phenomena Spring 2006 Exam #1 February 22, 2006 Name: While this is an open book exam no additional references of any kind are permitted. Write clearly your assumptions and any parameter definitions. Relevant volume and surface areas: rL SA r SA L r V r V cylinder sphere cylinder sphere π 2 4 3 4 2 2 3 = = = = 1. (20 pts) Qualitative Questions a) (10) Consider each of the steady-state temperature profiles given below. Are the profiles physically achievable? If so, which material (left or right) has the larger thermal conductivity? If not, give a reason that the profile cannot be achieved. Note: the slab of material on the left and right have the same dimensions (i.e. length, cross sectional area). (i) (ii) (iii) (iv) b) (10) Consider the two images shown below which were taken 5 seconds after rotation began, where the rotation speed is the same for both cases. The white line provides the line position before rotation began. Both images were taken for situations with Re>1.
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ech%203264_exam1_Sp06 - ECH 3264: Spring 2006 Exam #1...

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