Temperature of gases in a trace of water droplets during their motion in a flame
| Parent link: | Thermal Science Vol. 22, iss. 1, pt. A.— 2018.— [P. 335-346] |
|---|---|
| Autor principal: | |
| Autor corporatiu: | , |
| Altres autors: | , |
| Sumari: | Title screen The paper experimentally investigates the integral characteristics of the process¬es involved in the reduction of gas temperature by injecting the aerosol flow of water droplets into a counter flow of combustion products (period of steady low gas temperature, Tg', compared to the initial, Tg, range of temperature decrease (ΔTg = Tg - Tg'), rate of temperature recovery, the geometric dimensions of the temperature traces and their lifetime). We use the following recording devices: fast-response thermocouples (heat inertia less than 0.1 second), a multi-channel recorder, a high speed video camera (up to 105 frames per second), as well as a cross-correlation hardware and software package (with optical methods for re¬cording the front and trace of the aerosol). The temperature trace of an aerosol is defined as the area with the temperature Tg' lower than the initial Tg by at least 10 K. We determine how the following group of factors affects the characteris¬tics of temperature traces of water droplets: size (0.04-0.4 mm) and concentra¬tions (3·10-5-11·10-5 m3 of droplet per m3 of gas) of droplets in a pulse, the ini¬tial temperature of water (280-340 K), the duration of a pulse (1-5 seconds), the temperature (350-950 K) and velocities (0.5-5 m/s) of combustion products. The temperature in a trace of water droplets during their motion in a flame can be reduced due to rapid vaporization or heat exchange between the gases and water. The conditions are identified, under which the low temperature of gases in a trace of droplet aerosol can be preserved for a long time (20-30 seconds). Finally, we forecast the parameters of temperature traces under the conditions of actual fires with combustion product temperatures over 1000 K. |
| Idioma: | anglès |
| Publicat: |
2018
|
| Matèries: | |
| Accés en línia: | http://earchive.tpu.ru/handle/11683/57274 https://doi.org/10.2298/TSCI160302020V |
| Format: | Electrònic Capítol de llibre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=660945 |
MARC
| LEADER | 00000naa0a2200000 4500 | ||
|---|---|---|---|
| 001 | 660945 | ||
| 005 | 20250409132834.0 | ||
| 035 | |a (RuTPU)RU\TPU\network\31096 | ||
| 090 | |a 660945 | ||
| 100 | |a 20191108d2018 k||y0rusy50 ba | ||
| 101 | 0 | |a eng | |
| 135 | |a drcn ---uucaa | ||
| 181 | 0 | |a i | |
| 182 | 0 | |a b | |
| 200 | 1 | |a Temperature of gases in a trace of water droplets during their motion in a flame |f I. S. Voytkov, R. S. Volkov, P. A. Strizhak | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 22 tit.] | ||
| 330 | |a The paper experimentally investigates the integral characteristics of the process¬es involved in the reduction of gas temperature by injecting the aerosol flow of water droplets into a counter flow of combustion products (period of steady low gas temperature, Tg', compared to the initial, Tg, range of temperature decrease (ΔTg = Tg - Tg'), rate of temperature recovery, the geometric dimensions of the temperature traces and their lifetime). We use the following recording devices: fast-response thermocouples (heat inertia less than 0.1 second), a multi-channel recorder, a high speed video camera (up to 105 frames per second), as well as a cross-correlation hardware and software package (with optical methods for re¬cording the front and trace of the aerosol). The temperature trace of an aerosol is defined as the area with the temperature Tg' lower than the initial Tg by at least 10 K. We determine how the following group of factors affects the characteris¬tics of temperature traces of water droplets: size (0.04-0.4 mm) and concentra¬tions (3·10-5-11·10-5 m3 of droplet per m3 of gas) of droplets in a pulse, the ini¬tial temperature of water (280-340 K), the duration of a pulse (1-5 seconds), the temperature (350-950 K) and velocities (0.5-5 m/s) of combustion products. The temperature in a trace of water droplets during their motion in a flame can be reduced due to rapid vaporization or heat exchange between the gases and water. The conditions are identified, under which the low temperature of gases in a trace of droplet aerosol can be preserved for a long time (20-30 seconds). Finally, we forecast the parameters of temperature traces under the conditions of actual fires with combustion product temperatures over 1000 K. | ||
| 461 | |t Thermal Science | ||
| 463 | |t Vol. 22, iss. 1, pt. A |v [P. 335-346] |d 2018 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a water | |
| 610 | 1 | |a droplets | |
| 610 | 1 | |a aerosol | |
| 610 | 1 | |a high-temperature gases | |
| 610 | 1 | |a flame | |
| 610 | 1 | |a combustion products | |
| 610 | 1 | |a temperature trace | |
| 610 | 1 | |a вода | |
| 610 | 1 | |a капля | |
| 610 | 1 | |a пламя | |
| 610 | 1 | |a продукты сгорания | |
| 700 | 1 | |a Voytkov |b I. S. |g Ivan Sergeevich | |
| 701 | 1 | |a Volkov |b R. S. |c specialist in the field of power engineering |c Associate Professor of the Tomsk Polytechnic University, candidate of technical Sciences |f 1987- |g Roman Sergeevich |3 (RuTPU)RU\TPU\pers\33926 |9 17499 | |
| 701 | 1 | |a Strizhak |b P. A. |c Specialist in the field of heat power energy |c Doctor of Physical and Mathematical Sciences (DSc), Professor of Tomsk Polytechnic University (TPU) |f 1985- |g Pavel Alexandrovich |3 (RuTPU)RU\TPU\pers\30871 |9 15117 | |
| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Исследовательская школа физики высокоэнергетических процессов |c (2017- ) |3 (RuTPU)RU\TPU\col\23551 |
| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Инженерная школа энергетики |b Научно-образовательный центр И. Н. Бутакова (НОЦ И. Н. Бутакова) |3 (RuTPU)RU\TPU\col\23504 |
| 801 | 2 | |a RU |b 63413507 |c 20200110 |g RCR | |
| 856 | 4 | |u http://earchive.tpu.ru/handle/11683/57274 | |
| 856 | 4 | |u https://doi.org/10.2298/TSCI160302020V | |
| 942 | |c CF | ||