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Throttling Process When a fluid flo
Throttling Process
When a fluid flows through a restriction, such as an orifice, a partly closed valve, or a porous
plug, without any appreciable change in lunetic or potential energy, the primary result of the
process is a pressure drop in the fluid. Such a throttling process produces no shaft work, and
in the absence of heat transfer, Eq. (2.32) reduces to
The process therefore occurs at constant enthalpy.
Since the enthalpy of an ideal gas depends on temperature only, a throttling process
does not change the temperature of an ideal gas. For most real gases at moderate condi-
tions of temperature and pressure, a reduction in pressure at constant enthalpy results in a de-
crease in temperature. For example, if steam at 1000 kPa and 573.15 K (300°C) is throttled to
101.325 kPa (atmospheric pressure),
H2 = HI = 3052.1 kJ kg-'
Interpolation in the steam tables at this enthalpy and at a pressure of 101.325 Pa indicates a
downstream temperature of 561.95 K (288.8"C). The temperature has decreased, but the effect
is small.
When a fluid flows through a restriction, such as an orifice, a partly closed valve, or a porous
plug, without any appreciable change in lunetic or potential energy, the primary result of the
process is a pressure drop in the fluid. Such a throttling process produces no shaft work, and
in the absence of heat transfer, Eq. (2.32) reduces to
The process therefore occurs at constant enthalpy.
Since the enthalpy of an ideal gas depends on temperature only, a throttling process
does not change the temperature of an ideal gas. For most real gases at moderate condi-
tions of temperature and pressure, a reduction in pressure at constant enthalpy results in a de-
crease in temperature. For example, if steam at 1000 kPa and 573.15 K (300°C) is throttled to
101.325 kPa (atmospheric pressure),
H2 = HI = 3052.1 kJ kg-'
Interpolation in the steam tables at this enthalpy and at a pressure of 101.325 Pa indicates a
downstream temperature of 561.95 K (288.8"C). The temperature has decreased, but the effect
is small.
0/5000
Throttling Process
When a fluid flows through a restriction, such as an orifice, a partly closed valve, or a porous
plug, without any appreciable change in lunetic or potential energy, the primary result of the
process is a pressure drop in the fluid. Such a throttling process produces no shaft work, and
in the absence of heat transfer, Eq. (2.32) reduces to
The process therefore occurs at constant enthalpy.
Since the enthalpy of an ideal gas depends on temperature only, a throttling process
does not change the temperature of an ideal gas. For most real gases at moderate condi-
tions of temperature and pressure, a reduction in pressure at constant enthalpy results in a de-
crease in temperature. For example, if steam at 1000 kPa and 573.15 K (300°C) is throttled to
101.325 kPa (atmospheric pressure),
H2 = HI = 3052.1 kJ kg-'
Interpolation in the steam tables at this enthalpy and at a pressure of 101.325 Pa indicates a
downstream temperature of 561.95 K (288.8"C). The temperature has decreased, but the effect
is small.
When a fluid flows through a restriction, such as an orifice, a partly closed valve, or a porous
plug, without any appreciable change in lunetic or potential energy, the primary result of the
process is a pressure drop in the fluid. Such a throttling process produces no shaft work, and
in the absence of heat transfer, Eq. (2.32) reduces to
The process therefore occurs at constant enthalpy.
Since the enthalpy of an ideal gas depends on temperature only, a throttling process
does not change the temperature of an ideal gas. For most real gases at moderate condi-
tions of temperature and pressure, a reduction in pressure at constant enthalpy results in a de-
crease in temperature. For example, if steam at 1000 kPa and 573.15 K (300°C) is throttled to
101.325 kPa (atmospheric pressure),
H2 = HI = 3052.1 kJ kg-'
Interpolation in the steam tables at this enthalpy and at a pressure of 101.325 Pa indicates a
downstream temperature of 561.95 K (288.8"C). The temperature has decreased, but the effect
is small.
Sedang diterjemahkan, harap tunggu..
Throttling Proses
Ketika cairan mengalir melalui pembatasan, seperti sebuah lubang, katup sebagian tertutup, atau berpori
steker, tanpa ada perubahan berarti dalam energi lunetic atau potensial, hasil utama dari
proses penurunan tekanan dalam cairan. Seperti proses throttling tidak menghasilkan kerja poros, dan
dengan tidak adanya perpindahan panas, Persamaan. (2.32) tereduksi menjadi
proses Oleh karena itu terjadi di enthalpy konstan.
Karena entalpi gas ideal tergantung pada suhu saja, proses throttling
tidak mengubah suhu gas ideal. Bagi sebagian besar gas nyata di-kondisi moderat
tions suhu dan tekanan, penurunan tekanan pada hasil entalpi konstan dalam de-
lipatan suhu. Sebagai contoh, jika steam pada 1000 kPa dan 573,15 K (300 ° C) yang mencekik ke
101,325 kPa (tekanan atmosfer),
H2 = HI = 3052,1 kJ kg-'
interpolasi pada tabel uap pada entalpi ini dan pada tekanan 101,325 Pa menunjukkan
suhu hilir 561,95 K (288,8 "C). Suhu mengalami penurunan, tetapi efeknya
kecil.
Ketika cairan mengalir melalui pembatasan, seperti sebuah lubang, katup sebagian tertutup, atau berpori
steker, tanpa ada perubahan berarti dalam energi lunetic atau potensial, hasil utama dari
proses penurunan tekanan dalam cairan. Seperti proses throttling tidak menghasilkan kerja poros, dan
dengan tidak adanya perpindahan panas, Persamaan. (2.32) tereduksi menjadi
proses Oleh karena itu terjadi di enthalpy konstan.
Karena entalpi gas ideal tergantung pada suhu saja, proses throttling
tidak mengubah suhu gas ideal. Bagi sebagian besar gas nyata di-kondisi moderat
tions suhu dan tekanan, penurunan tekanan pada hasil entalpi konstan dalam de-
lipatan suhu. Sebagai contoh, jika steam pada 1000 kPa dan 573,15 K (300 ° C) yang mencekik ke
101,325 kPa (tekanan atmosfer),
H2 = HI = 3052,1 kJ kg-'
interpolasi pada tabel uap pada entalpi ini dan pada tekanan 101,325 Pa menunjukkan
suhu hilir 561,95 K (288,8 "C). Suhu mengalami penurunan, tetapi efeknya
kecil.
Sedang diterjemahkan, harap tunggu..
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