CSNI1002 PDHT-HP.
PDHT-HP, Post Dryout Heat Transfer Experiments, Upflow and Downflow Conditions
NAME OR DESIGNATION, COMPUTER, DESCRIPTION OF TEST FACILITY, DESCRIPTION OF TESTS, EXPERIMENTAL LIMITATIONS OR SHORTCOMINGS, PHENOMENA TESTED, SPECIAL FEATURES OF EXPERIMENTS, COUNTERPART EXPERIMENTS, STATUS, REFERENCES, TEST DESIGNATION, LANGUAGE, ESTABLISHMENT, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| PDHT-HP | CSNI1002/02 | Arrived | 01-AUG-2001 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| CSNI1002/02 | Many Computers |
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3. DESCRIPTION OF TEST FACILITY
The Winfrith High Pressure Rig operated on a once-through system using positive displacement pumps to provide a flow of up to 0.9kg/s of demineralised water at pressures up to 34.0Mpa. The water was heated to the required temperature by a 750kW pre-heater. Both inlet and outlet pipework were fitted with drain valves and could be trace heated by an automatic temperature controlled system. A nitrogen supply was provided for purging the system. The vertically mounted test section consisted of a Nimonic 75 tube, 9.75mm ID and 14.0mm OD with a heated length of 920mm, which was directly heated by a manually controlled AC supply. Power was introduced by two 36mm thick nickel-plated copper blocks at either end of the heated length, which acted as the hot patches and were instrumented with thermocouples to enable the heat fluxed to be evaluated. The position of the dry-out front was maintained upstream of the test section by heat transfer from the hot patches. The test section itself had a total of 42 bare wire thermocouples, 0.3mm in diameter, positioned in pairs and attached to the outer surface.
The Winfrith High Pressure Rig operated on a once-through system using positive displacement pumps to provide a flow of up to 0.9kg/s of demineralised water at pressures up to 34.0Mpa. The water was heated to the required temperature by a 750kW pre-heater. Both inlet and outlet pipework were fitted with drain valves and could be trace heated by an automatic temperature controlled system. A nitrogen supply was provided for purging the system. The vertically mounted test section consisted of a Nimonic 75 tube, 9.75mm ID and 14.0mm OD with a heated length of 920mm, which was directly heated by a manually controlled AC supply. Power was introduced by two 36mm thick nickel-plated copper blocks at either end of the heated length, which acted as the hot patches and were instrumented with thermocouples to enable the heat fluxed to be evaluated. The position of the dry-out front was maintained upstream of the test section by heat transfer from the hot patches. The test section itself had a total of 42 bare wire thermocouples, 0.3mm in diameter, positioned in pairs and attached to the outer surface.
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4. DESCRIPTION OF TESTS
Steady state tests were performed to evaluate post-dryout heat transfer in upflow and downflow conditions. For the upflow tests, conditions were varied over the following ranges; pressure = 0.2 - 2.01Mpa, flow = 48 - 1010kg/m2s, inlet subcooling = 2.4 - 26.4 deg.C, equilibrium quality = 0 - 58% and heat flux = 14 - 360Kw/M2. For the downflow tests, conditions were varied over the following ranges; pressure = 0.2 - 0.51Mpa, flow = 48 - 504kg/m2s, inlet subcooling = 3.9 - 8.3 deg.C. equilibrium quality = 0 - 19% and heat flux = 6 - 150kW/m2.
Steady state tests were performed to evaluate post-dryout heat transfer in upflow and downflow conditions. For the upflow tests, conditions were varied over the following ranges; pressure = 0.2 - 2.01Mpa, flow = 48 - 1010kg/m2s, inlet subcooling = 2.4 - 26.4 deg.C, equilibrium quality = 0 - 58% and heat flux = 14 - 360Kw/M2. For the downflow tests, conditions were varied over the following ranges; pressure = 0.2 - 0.51Mpa, flow = 48 - 504kg/m2s, inlet subcooling = 3.9 - 8.3 deg.C. equilibrium quality = 0 - 19% and heat flux = 6 - 150kW/m2.
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10. REFERENCES
- D Swinnerton, KC Pearson and M L Hood:
Steady State Post-Dryout Experiments at Low Quality and Medium Pressure (AEEW-R2192, 1988)
- D Swinnerton, KC Pearson and M L Hood:
Steady State Post-Dryout Experiments at Low Quality and Medium Pressure (AEEW-R2192, 1988)
CSNI1002/02, included references:
- D Swinnerton, M L Hood and KC Pearson:Steady State Post-Dryout at Low Quality and Medium Pressure
AEEW-R2267, June 1988
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Keywords: data, heat transfer.