By R. T. Lahey Jr., D. A. Drew (auth.), Jeffery Lewins, Martin Becker (eds.)

ISBN-10: 1461399254

ISBN-13: 9781461399254

ISBN-10: 1461399270

ISBN-13: 9781461399278

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K ~ (Re) . ) glven in Equation (l05), which is related to T in Equation (106). Thus these terms are normally neglected in the engineering analyses of two-phase flow. qk" , The phasic volumetric internal generation terms, may be due to effects such as photon or neutron heating of the fluid. These parameters must be separately specified. For instance, they might be specified by a radiation attenuation calculation. Similarly, the interfacial source term due 47 THREE-DIMENSIONAL CONSERVATION EQUATION to radiation heat transfer, q" R.

DREW 1 - V + Mnd • -k. 1 + q" A" kw k w + q" A" k. • -k. S'" -. r T + ~k 'i t nd V -k n v V d -k i (64) k 1 where, Sf m" e k dS k a. (x,t) 1- ek . (65a) Sf 1 m" dS k a. (x,t) 1- Mnd -k. rid q" k. A~" Md -k. • V q" k A'" 1 1 1 w T ::'k. 1 'Vnd 1 Sf V a. (x,t) /:'P k . ~k /:, 1- 1 /:, 1 q" k. ai/V 1- 1 k w /:, . , · i . -k. 'Vd /:'P /:, <_k_>. rk Pk 1 1 1 V w I IV /:, 'L·d [/:'P k . J(~,t) /:, 1 V Sf 1- a. (x,t) 1- If a. (x,t) ~k /:,~d k. 1 (m" /:'~k. ::'k dS, (65d) 1 ~k W (65c) dS, ~k 1- V a.

Unfortunately, it is currently not possible to model this term accurately in twophase flows. As a consequence, it is often neglected. g. in subchannel analysis) ad hoc models are normally employed (8). Fortunately research is currently underway of two-phase turbulence, thus the current state-ofthe-art should improve. ~~e It is common practice to implicitly assume that all the interfacial velocities are equal. Hence, r nd ~k ~k. i l Thus, i f . r ~k. l d (119a) ~k. k is a b. nd T vd • (119b) = v U.

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Advances in Nuclear Science and Technology by R. T. Lahey Jr., D. A. Drew (auth.), Jeffery Lewins, Martin Becker (eds.)

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