Continuous vs. pulsating flow boiling. Part 1: Experimental comparison and visualization Article Swipe
High heat exchanger performance is crucial to meet efficiency standards with low cost and environmental impact. Heat transfer performance may be improved by passive and active enhancement techniques applicable to air, liquid and phase change heat exchangers. This experimental study investigates an active method for flow boiling heat transfer enhancement by means of fluid flow pulsation. The pulsations are believed to increase the flow boiling heat transfer by means of better bulk fluid mixing, wall wetting and flow-regime destabilization. The pulsations are introduced by a flow modulating expansion device and compared with continuous flow from a stepper-motor expansion valve. The cycle time range from 1 to 9 seconds for the pulsations. Transient heat transfer coefficients are measured downstream from the expansion valve at low vapor qualities and the time-averaged heat transfer coefficients are compared to those with continuous fluid flow. The results show that the pulsations improve the time-averaged heat transfer coefficient by up to 5 % at low cycle time, whereas the pulsations reduce the time-averaged heat transfer coefficient by up to 8 % at high cycle time and heat flux. The latter reduction is adhered to significant dry-out when the expansion valve is closed. The test section consists of the two exchangeable expansion valves and a tube-in-tube evaporator with four subsections for measuring the heat transfer coefficient. Refrigerant R134a flows internally and water flows externally. The inner tube internal diameter is 8 mm and each subsection is 0.25 m long. Temperatures in and out of each subsection are measured as well as the water flow rate. Wall temperatures are measured outside on the internal tube in the top and the bottom of each subsection as well as refrigerant temperature, pressure and flow rate. The evaporation temperature is kept at 5°C during the experiments and the fluid state before the expansion valve is kept at a condensing temperature and subcooling of 32.5°C and 2 K, respectively. The time-averaged refrigerant mass flux varies from 41 to 167 kg/m2s, vapor qualities from 0.18 to 0.59 and heat fluxes from 0.8 to 45 kW/m2. The paper includes a description of the test rig, the data reduction method, uncertainty propagation and the results and comparison.Â
Related Topics
Concepts
Boiling
Flow visualization
Flow boiling
Visualization
Flow (mathematics)
Mechanics
Computer science
Thermodynamics
Nucleate boiling
Physics
Data mining
Heat transfer
Heat transfer coefficient
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://docs.lib.purdue.edu/iracc/1781
- https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2780&context=iracc
- OA Status
- green
- Cited By
- 5
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W2563156611
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W2563156611Canonical identifier for this work in OpenAlex
- Title
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Continuous vs. pulsating flow boiling. Part 1: Experimental comparison and visualizationWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2016Year of publication
- Publication date
-
2016-01-01Full publication date if available
- Authors
-
Martin Ryhl Kærn, Brian Elmegaard, Knud Erik Meyer, Björn PalmList of authors in order
- Landing page
-
https://docs.lib.purdue.edu/iracc/1781Publisher landing page
- PDF URL
-
https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2780&context=iraccDirect link to full text PDF
- Open access
-
YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
- OA URL
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https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2780&context=iraccDirect OA link when available
- Concepts
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Boiling, Flow visualization, Flow boiling, Visualization, Flow (mathematics), Mechanics, Computer science, Thermodynamics, Nucleate boiling, Physics, Data mining, Heat transfer, Heat transfer coefficientTop concepts (fields/topics) attached by OpenAlex
- Cited by
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5Total citation count in OpenAlex
- Citations by year (recent)
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2024: 1, 2023: 1, 2022: 1, 2021: 1, 2019: 1Per-year citation counts (last 5 years)
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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| abstract_inverted_index.a | 84, 95, 207, 306, 345 |
| abstract_inverted_index.m | 240 |
| abstract_inverted_index.41 | 324 |
| abstract_inverted_index.45 | 340 |
| abstract_inverted_index.K, | 315 |
| abstract_inverted_index.an | 41 |
| abstract_inverted_index.as | 251, 253, 276, 278 |
| abstract_inverted_index.at | 122, 157, 175, 290, 305 |
| abstract_inverted_index.be | 20 |
| abstract_inverted_index.by | 22, 50, 67, 83, 152, 170 |
| abstract_inverted_index.in | 243, 267 |
| abstract_inverted_index.is | 4, 185, 194, 232, 238, 288, 303 |
| abstract_inverted_index.mm | 234 |
| abstract_inverted_index.of | 52, 69, 200, 246, 273, 311, 347 |
| abstract_inverted_index.on | 263 |
| abstract_inverted_index.to | 6, 29, 60, 105, 134, 154, 172, 187, 325, 332, 339 |
| abstract_inverted_index.up | 153, 171 |
| abstract_inverted_index.0.8 | 338 |
| abstract_inverted_index.167 | 326 |
| abstract_inverted_index.The | 56, 79, 99, 140, 182, 196, 227, 285, 317, 342 |
| abstract_inverted_index.and | 13, 24, 32, 76, 89, 126, 179, 206, 223, 235, 244, 270, 282, 295, 309, 313, 334, 357, 360 |
| abstract_inverted_index.are | 58, 81, 115, 132, 249, 260 |
| abstract_inverted_index.for | 44, 108, 213 |
| abstract_inverted_index.low | 11, 123, 158 |
| abstract_inverted_index.may | 19 |
| abstract_inverted_index.out | 245 |
| abstract_inverted_index.the | 62, 109, 119, 127, 144, 147, 162, 165, 191, 201, 215, 254, 264, 268, 271, 293, 296, 300, 348, 351, 358 |
| abstract_inverted_index.top | 269 |
| abstract_inverted_index.two | 202 |
| abstract_inverted_index.0.18 | 331 |
| abstract_inverted_index.0.25 | 239 |
| abstract_inverted_index.0.59 | 333 |
| abstract_inverted_index.Heat | 16 |
| abstract_inverted_index.High | 0 |
| abstract_inverted_index.This | 37 |
| abstract_inverted_index.Wall | 258 |
| abstract_inverted_index.air, | 30 |
| abstract_inverted_index.bulk | 71 |
| abstract_inverted_index.cost | 12 |
| abstract_inverted_index.data | 352 |
| abstract_inverted_index.each | 236, 247, 274 |
| abstract_inverted_index.flow | 45, 54, 63, 85, 93, 256, 283 |
| abstract_inverted_index.flux | 321 |
| abstract_inverted_index.four | 211 |
| abstract_inverted_index.from | 94, 103, 118, 323, 330, 337 |
| abstract_inverted_index.heat | 1, 35, 47, 65, 112, 129, 149, 167, 180, 216, 335 |
| abstract_inverted_index.high | 176 |
| abstract_inverted_index.kept | 289, 304 |
| abstract_inverted_index.mass | 320 |
| abstract_inverted_index.meet | 7 |
| abstract_inverted_index.rig, | 350 |
| abstract_inverted_index.show | 142 |
| abstract_inverted_index.test | 197, 349 |
| abstract_inverted_index.that | 143 |
| abstract_inverted_index.time | 101, 178 |
| abstract_inverted_index.tube | 229, 266 |
| abstract_inverted_index.wall | 74 |
| abstract_inverted_index.well | 252, 277 |
| abstract_inverted_index.when | 190 |
| abstract_inverted_index.with | 10, 91, 136, 210 |
| abstract_inverted_index.R134a | 220 |
| abstract_inverted_index.cycle | 100, 159, 177 |
| abstract_inverted_index.flow. | 139 |
| abstract_inverted_index.flows | 221, 225 |
| abstract_inverted_index.fluid | 53, 72, 138, 297 |
| abstract_inverted_index.flux. | 181 |
| abstract_inverted_index.inner | 228 |
| abstract_inverted_index.long. | 241 |
| abstract_inverted_index.means | 51, 68 |
| abstract_inverted_index.paper | 343 |
| abstract_inverted_index.phase | 33 |
| abstract_inverted_index.range | 102 |
| abstract_inverted_index.rate. | 257, 284 |
| abstract_inverted_index.state | 298 |
| abstract_inverted_index.study | 39 |
| abstract_inverted_index.those | 135 |
| abstract_inverted_index.time, | 160 |
| abstract_inverted_index.valve | 121, 193, 302 |
| abstract_inverted_index.vapor | 124, 328 |
| abstract_inverted_index.water | 224, 255 |
| abstract_inverted_index.5°C | 291 |
| abstract_inverted_index.active | 25, 42 |
| abstract_inverted_index.before | 299 |
| abstract_inverted_index.better | 70 |
| abstract_inverted_index.bottom | 272 |
| abstract_inverted_index.change | 34 |
| abstract_inverted_index.device | 88 |
| abstract_inverted_index.during | 292 |
| abstract_inverted_index.fluxes | 336 |
| abstract_inverted_index.kW/m2. | 341 |
| abstract_inverted_index.latter | 183 |
| abstract_inverted_index.liquid | 31 |
| abstract_inverted_index.method | 43 |
| abstract_inverted_index.reduce | 164 |
| abstract_inverted_index.valve. | 98 |
| abstract_inverted_index.valves | 205 |
| abstract_inverted_index.varies | 322 |
| abstract_inverted_index.adhered | 186 |
| abstract_inverted_index.boiling | 46, 64 |
| abstract_inverted_index.closed. | 195 |
| abstract_inverted_index.crucial | 5 |
| abstract_inverted_index.dry-out | 189 |
| abstract_inverted_index.impact. | 15 |
| abstract_inverted_index.improve | 146 |
| abstract_inverted_index.kg/m2s, | 327 |
| abstract_inverted_index.method, | 354 |
| abstract_inverted_index.mixing, | 73 |
| abstract_inverted_index.outside | 262 |
| abstract_inverted_index.passive | 23 |
| abstract_inverted_index.results | 141, 359 |
| abstract_inverted_index.seconds | 107 |
| abstract_inverted_index.section | 198 |
| abstract_inverted_index.wetting | 75 |
| abstract_inverted_index.whereas | 161 |
| abstract_inverted_index.believed | 59 |
| abstract_inverted_index.compared | 90, 133 |
| abstract_inverted_index.consists | 199 |
| abstract_inverted_index.diameter | 231 |
| abstract_inverted_index.improved | 21 |
| abstract_inverted_index.includes | 344 |
| abstract_inverted_index.increase | 61 |
| abstract_inverted_index.internal | 230, 265 |
| abstract_inverted_index.measured | 116, 250, 261 |
| abstract_inverted_index.pressure | 281 |
| abstract_inverted_index.transfer | 17, 48, 66, 113, 130, 150, 168, 217 |
| abstract_inverted_index.32.5°C | 312 |
| abstract_inverted_index.Transient | 111 |
| abstract_inverted_index.exchanger | 2 |
| abstract_inverted_index.expansion | 87, 97, 120, 192, 204, 301 |
| abstract_inverted_index.measuring | 214 |
| abstract_inverted_index.qualities | 125, 329 |
| abstract_inverted_index.reduction | 184, 353 |
| abstract_inverted_index.standards | 9 |
| abstract_inverted_index.applicable | 28 |
| abstract_inverted_index.condensing | 307 |
| abstract_inverted_index.continuous | 92, 137 |
| abstract_inverted_index.downstream | 117 |
| abstract_inverted_index.efficiency | 8 |
| abstract_inverted_index.evaporator | 209 |
| abstract_inverted_index.internally | 222 |
| abstract_inverted_index.introduced | 82 |
| abstract_inverted_index.modulating | 86 |
| abstract_inverted_index.pulsation. | 55 |
| abstract_inverted_index.pulsations | 57, 80, 145, 163 |
| abstract_inverted_index.subcooling | 310 |
| abstract_inverted_index.subsection | 237, 248, 275 |
| abstract_inverted_index.techniques | 27 |
| abstract_inverted_index.Refrigerant | 219 |
| abstract_inverted_index.coefficient | 151, 169 |
| abstract_inverted_index.description | 346 |
| abstract_inverted_index.enhancement | 26, 49 |
| abstract_inverted_index.evaporation | 286 |
| abstract_inverted_index.exchangers. | 36 |
| abstract_inverted_index.experiments | 294 |
| abstract_inverted_index.externally. | 226 |
| abstract_inverted_index.flow-regime | 77 |
| abstract_inverted_index.performance | 3, 18 |
| abstract_inverted_index.propagation | 356 |
| abstract_inverted_index.pulsations. | 110 |
| abstract_inverted_index.refrigerant | 279, 319 |
| abstract_inverted_index.significant | 188 |
| abstract_inverted_index.subsections | 212 |
| abstract_inverted_index.temperature | 287, 308 |
| abstract_inverted_index.uncertainty | 355 |
| abstract_inverted_index.Temperatures | 242 |
| abstract_inverted_index.coefficient. | 218 |
| abstract_inverted_index.coefficients | 114, 131 |
| abstract_inverted_index.exchangeable | 203 |
| abstract_inverted_index.experimental | 38 |
| abstract_inverted_index.investigates | 40 |
| abstract_inverted_index.temperature, | 280 |
| abstract_inverted_index.temperatures | 259 |
| abstract_inverted_index.tube-in-tube | 208 |
| abstract_inverted_index.comparison. | 361 |
| abstract_inverted_index.environmental | 14 |
| abstract_inverted_index.respectively. | 316 |
| abstract_inverted_index.stepper-motor | 96 |
| abstract_inverted_index.time-averaged | 128, 148, 166, 318 |
| abstract_inverted_index.destabilization. | 78 |
| cited_by_percentile_year.max | 94 |
| cited_by_percentile_year.min | 89 |
| countries_distinct_count | 2 |
| institutions_distinct_count | 4 |
| citation_normalized_percentile.value | 0.6450006 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |