A quasi one-dimensional method and results for steady annular/stratified shear and gravity driven condensing flows

Mitra, Soumya Asimkumar; Narain, Amitabh; Naik, Ranjeeth R.; Kulkarni, Shantanu

doi:10.1016/j.ijheatmasstransfer.2011.03.008

Cited by 20 publications

(38 citation statements)

References 17 publications

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“…The experiments as well as related correlations (Shah [4], Cavallini et al [5], etc.) in the literature typically cover a large set of flow regimes and associated flow physics categories (see Mitra et al [6] and Kurita et al [7]).…”

Section: Introductionmentioning

confidence: 99%

Shear/Pressure Driven Internal Condensing Flows and Their Sensitivity to Inlet Pressure Fluctuations

Kivisalu

Gorgitrattanagul

Mitra

et al. 2011

Volume 10: Heat and Mass Transport Processes, Parts a and B

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The reported experimental results are for annular zones of fully condensing flows of pure FC-72 vapor. The flow condenses on the bottom surface (316 Stainless Steel) of a horizontal, rectangular cross-section duct. The sides and top of the duct are made of clear plastic. The experimental system in which this condenser is used is able to control steady-in-the-mean (termed quasi-steady) values of mass flow rate, inlet (or exit) pressure, and wall cooling conditions. It has been reported elsewhere that, with the condenser mean (time averaged) inlet mass flow rate, mean inlet (or exit) pressure, and wall cooling condition held at quasi-steady values, there is a very strong sensitivity to certain impositions of pressure fluctuations and accompanying flow rate pulsations at the condenser inlet. For these impositions, it was found that the mean exit (or inlet) pressure changes to significantly affect mean test-section pressure difference, local heat-flux variations over the annular portion of the flow, and the nature of the annular flow regime. This paper experimentally investigates how the strength of this sensitivity varies with amplitude and frequency of pressure fluctuations imposed on the inlet of the condenser from the vapor line. It has been found that, for various frequencies of interest, there are typically two classes of responses to inlet pressure fluctuations. These are termed supercritical (for the larger amplitudes for which a strong sensitivity exists) and subcritical (for the smaller amplitudes for which a weak sensitivity exists).

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Section: Introductionmentioning

confidence: 99%

Shear/Pressure Driven Internal Condensing Flows and Their Sensitivity to Inlet Pressure Fluctuations

Kivisalu

Gorgitrattanagul

Mitra

et al. 2011

Volume 10: Heat and Mass Transport Processes, Parts a and B

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“…High heat transfer rates are achieved in the stratified/annular flow regime as the liquid condensate is always in immediate contact to the heat exchange surface of the condensers, yielding lower resistance to the flow of heat. A large number of published results [2,6] substantiate the facts that gravity driven flows are more stable, and essentially occur in the annular/stratified flow regime.…”

Section: Purpose Of This Research and Complications Associated With Imentioning

confidence: 89%

“…This research provides a structured approach in assessing the efficacy of existing semiempirical heat transfer correlations [11,[16][17][18] and further assists in the development of such correlations for other flow regimes. Furthermore, results from existing study are compared with results obtained and proposed in the study using an approximate Quasi 1D [2] condensing flow simulation tool with a combination of experimental data [13,14] and nearly exact 2D steady/unsteady simulation tools [3,[19][20][21].…”

Section: Purpose Of This Research and Complications Associated With Imentioning

confidence: 99%

“…Steady, incompressible, two dimensional governing equations of the form of differential equations for mass, momentum and energy balance are solved (see [2,3]) for the flow variables within each phase (I = 1 or I = 2) of the condensing flow. The nondimensional representation of these equations are defined as follows [22]:…”

Section: Governing Equations For Condensing Flowsmentioning

confidence: 99%

“…This study also provides a basic structure for creating similar new correlations for various other flow types and regimes. For annular flows this is done by using two numerical tools, one which is highly efficient but in an approximate flow simulation tool (A Quasi 1-D Simulation tool [2]) and a nearly exact 2-D steady/unsteady simulation tool [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Elementary Assessments and Simulations Based Proposals for New Heat Transfer Correlations and Flow Regime Maps for Annular/Stratified Regime of Shear Driven Internal Condensing Flows

Ravikumar

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Prediction and Control of Internal Condensing Flows in the Experimental Context of their Inlet Condition Sensitivities

Kivisalu

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Microgravity Sci. Technol.

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A quasi one-dimensional method and results for steady annular/stratified shear and gravity driven condensing flows

Cited by 20 publications

References 17 publications

Shear/Pressure Driven Internal Condensing Flows and Their Sensitivity to Inlet Pressure Fluctuations

Shear/Pressure Driven Internal Condensing Flows and Their Sensitivity to Inlet Pressure Fluctuations

Elementary Assessments and Simulations Based Proposals for New Heat Transfer Correlations and Flow Regime Maps for Annular/Stratified Regime of Shear Driven Internal Condensing Flows

Prediction and Control of Internal Condensing Flows in the Experimental Context of their Inlet Condition Sensitivities

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